Breaking changes and deprecation notes for v6.4

Closes #18520

Co-Authored-By: Dominik Prokop <dominik.prokop@grafana.com>

* What's new 6.4 draft

* data model notes

* minor progress

* Only include top highlights list

* Add new query mode picker with different states for each query. Also really simple migration script

* Populate cross resource dropdowns

* Cleanup. Handle change events

* Add multi select picker for subscriptions

* Fix markup issue

* Prepare for new query mode

* More cleanup

* Handle multiple queries both in ds and backend

* Refactoring

* Improve migration

* Add support for multiselect display name

* Use multiselect also for locations and resources

* Add more typings

* Fix migrations

* Custom multiselect built for array of options instead of variables

* Add url builder test

* fix datasource tests

* UI fixes

* Improve query editor init

* Fix brokens tests

* Cleanup

* Fix tslint issue

* Change query mode display name

* Make sure alerting works for single queries

* Friendly error for multi resources

* Add temporary typings

* Readonly datasources should not be created via the API

* Return correct `ReadOnly` value in GetDataSourceByName

* LDAP: add nav link only if ldap enabled

* LDAP: /admin/ldap required admin permissions

Fixes: #18531

* Feature: Encapsulated dynamic imports with error boundary and suspense

* Refactor: Changes after PR review

* Align PageLoader and LoadingPlaceholder

* Updated loading failed UI abit

* Change Failed to Unable

Don't update total stats metrics if reporting is disabled.
New setting disable_total_stats for turning off update 
of total stats (stat_totals_*) metrics.

Ref #19137

* Organise data frame and vectors code

* Organise transformations

* Move dataframe utils to dataframe dir

* Organise datetime utils

* Organise text utils

* Organise logs utils

* Revert "Organise logs utils"

This reverts commit c24115c75558236770dfa2f151e81f71bcd9ddef.

* registry -> Registry

* Transformations reorg

* Explore: add no data points text to graph

* Explore: add console log for error (accidentaly removed)

* Explore: refactor, created getYAxes method for better readability

* Explore: remove unnecessary console.log

* Explore: fix getYAxes method to return value

* Graph: Simplify warning from no data points to No data

* Add items for navmodel and basic page

* add reducer and actions

* adding user mapping table component

* adding components for ldap tables

* add alert box on error

* close error alert box

* LDAP status page: connect APIs WIP

* LDAP debug: fetch connection status from API

* LDAP debug: fetch user info from API

* LDAP debug: improve connection error view

* LDAP debug: connection error tweaks

* LDAP debug: fix role mapping view

* LDAP debug: role mapping view tweaks

* LDAP debug: add bulk-sync button stub

* LDAP debug: minor refactor

* LDAP debug: show user teams

* LDAP debug: user info refactor

* LDAP debug: initial user page

* LDAP debug: minor refactor, remove unused angular wrapper

* LDAP debug: add sessions to user page

* LDAP debug: tweak user page

* LDAP debug: tweak view for disabled user

* LDAP debug: get sync info from API

* LDAP debug: user sync info

* LDAP debug: sync user button

* LDAP debug: clear error on page load

* LDAP debug: add user last sync info

* LDAP debug: actions refactor

* LDAP debug: roles and teams style tweaks

* Pass showAttributeMapping to LdapUserTeams

* LDAP debug: hide bulk sync button

* LDAP debug: refactor sessions component

* LDAP debug: fix loading user sessions

* LDAP debug: hide sync user button

* LDAP debug: fix fetching unavailable /ldap-sync-status endpoint

* LDAP debug: revert accidentally added fix

* LDAP debug: show error when LDAP is not enabled

* LDAP debug: refactor, move ldap components into ldap/ folder

* LDAP debug: styles refactoring

* LDAP debug: ldap reducer tests

* LDAP debug: ldap user reducer tests

* LDAP debug: fix connection error placement

* Text update

* LdapUser: Minor UI changes moving things around

* AlertBox: Removed icon-on-top as everywhere else it is centered, want to have it be consistent

* Elasticsearch Datasource: allow templating queries to order by doc_count

* Elasticsearch Datasource: add tests for doc_count templating queries

* Bump lodash to 4.17.15

* Bump pretty-format to 24.9.0

Fixes: #19114

* Update routing to require sign in on every route

* Review update

* Graph: constant series as override

- ability to define a series override that takes the first value of a
timeseries and produces constant series from it.

* Moved constant series override logic to grafana-ui

* Added docs for instant queries and constant series override

* DataFrame: Fixes to dealing with empty results

* review feedback fixes

* Explore: calculate intervals when building data source request

* Added unit test

* updated unit test

* Refactor: Renamed and changed Signature for OnHorizontalRegionSelected

* Refactor: Adds onHorizontalRegionSelected to GraphPanelController

* Refactor: Moves TimeSrv call to PanelChrome instead

* Loki: Updated cheat sheet with new filter syntax

- updated cheat sheet with new filter syntax
- added user-specific examples from the user's label set
- added link to LogQL docs
- separated styles for examples (clickable) and expressions

* Review feedback

* Find correct module files

* Add basic error tracing

* Add delete button to edit notification channel page

* Simplified code

Added missing alias redirect

Fixes #19022

* LDAP: Allow an user to be synchronised against LDAP
This PR introduces the /ldap/sync/:id endpoint. It allows a user to be synchronized against LDAP on demand.

A few things to note are:

LDAP needs to be enabled for the sync to work
It only works against users that originally authenticated against LDAP
If the user is the Grafana admin and it needs to be disabled - it will not sync the information
Includes a tiny refactor that favours the JSONEq assertion helper instead of manually parsing JSON strings.

Adds a new requirements page to the installation docs.
Wanted/needed some place to document known browser 
issues and thought that adding this missing page together 
with OS, hardware, database and browser requirements 
would be a good thing.
Fix: move 6.4 section in upgrade notes further down.

Fixes #16487
Ref #18690

* POC: trying to see if there is a way to support objects in template interpolations

* Added support for nested objects, and arrays

* Added accessor cache

* fixed unit tests

* First take

* Use links supplier in graph

* Add field's index to cache items

* Get field index from field cache

* CHange FiledCacheItem to FieldWithIndex

* Add refId to TimeSeries class

* Make field link supplier work with _series, _field and _value vars

* use field link supplier in graph

* Fix yaxis settings

* Update dashboard schema version and add migration for data links variables

* Update snapshots

* Update build in data link variables

* FieldCache - idx -> index

* Add current query results to panel editor

* WIP Updated data links dropdown to display new variables

* Fix build

* Update variables syntac in field display, update migration

* Field links supplier: review updates

* Add data frame view and field name to TimeSeries for later inspection

* Retrieve data frame from TimeSeries when clicking on plot graph

* Use data frame's index instead of view

* Retrieve data frame by index instead of view on TimeSeries

* Update data links prism regex

* Fix typecheck

* Add value variables to suggestions list

* UI update

* Rename field to config in DisplayProcessorOptions

* Proces single value of a field instead of entire data frame

* Updated font size from 10px to 12px for auto complete

* Replace fieldName with fieldIndex in TimeSeries

* Don't use .entries() for iterating in field cache

* Don't use FieldCache when retrieving field for datalinks in graph

* Add value calculation variable to data links (#19031)

* Add support for labels with dots in the name (#19033)

* Docs update

* Use field name instead of removed series.fieldName

* Add test dashboard

* Typos fix

* Make visualization tab subscribe to query results

* Added tags to dashboard so it shows up in lists

* minor docs fix

* Update singlestat-ish variables suggestions to contain series variables

* Decrease suggestions update debounce

* Enable whitespace characters(new line, space) in links and strip them when processing the data link

* minor data links UI update

* DataLinks: Add __from and __to variables suggestions to data links (#19093)

* Add from and to variables suggestions to data links

* Update docs

* UI update and added info text

* Change ESC global bind to bind (doesn't capture ESC on input)

* Close datalinks suggestions on ESC

* Remove unnecessary fragment

* Singlestat: fix format messes up on negative values if select duration (hh:mm:ss) unit

* Added test for 0