Make empty string if there is no panel description

- Lower strictNullChecks: true errors

* Chore: Move DisplayValue to grafana/data

* Chore: Move GraphSeriesXY to grafana/data

* Fix: Fixes incorrect handling of utc in timeEpic

* Chore: Renames dateTimeFromTimeZone to dateTimeForTimeZone

Allow datasource connection to postgres with password "scram-sha-256" 
authentification.

Fixes #14662

Fixes #17665

This commit addresses half of #13749 by making sure GetMetricData 
works for alerting. Math Expressions (compound metrics) will still not 
work for alerting, this would require a bigger refactoring of Grafana's 
alerting service. However, with this commit at least alerting for basic 
metrics with non empty query Id will work.

Fixes half of #13749

* CI: Added metric to track strict null errros

* Update scripts/ci-frontend-metrics.sh

Co-Authored-By: Hugo Häggmark <hugo.haggmark@grafana.com>

* Auth: Do not search for the user twice

Previously `initContextWithBasicAuth` did not use `LoginUserQuery`, doing
`GetUserByLoginQuery` only i.e. looking user in DB only, things changed when
this function started to check LDAP provider via `LoginUserQuery` (#6940),
however, this request was placed after `GetUserByLoginQuery`, so we first
looking in DB then in the LDAP - if LDAP user hasn't logged in we will
not find it in DB, so `LoginUserQuery` will never be reached.

`LoginUserQuery` request already performs `GetUserByLoginQuery`
request in correct sequence. So we can just remove redundant request.

* Correct sequence execution during authentification &
  introduce tests for it

* Move basic auth tests to separate test file, since main test file already
  pretty large

* Introduce `testing.go` for the middleware module

* Remove redundant test helper function

* Make handler names more explicit

Ref 5777f65d
Fixes #18329

* Auth: address review comment

* added alert rule tags in webhook notifications

* fix: don't include whole list of Tag objects but only key/value pairs in Webhook JSON

* marked webhook alerts to support alert rule tags

* Changelog: v6.3.0-beta3

* Changelog: 6.3.0-beta4

* UI: Fixes issue where ToggleButtonGroup overlapped DataSourcePicker in Firefox
Closes #17692

* Select: added more padding to right to make space for indicator/caret

* Connect SignIn with redux and get url

* Update test snapshot

* Add tests for errors basic auth cases and moves tests to separate test-case.
Also names test cases consistently

* Add additional test helper

Ref 82661b9f

* LDAP: nitpicks

* Add more tests

* Correct and clarify comment for Login() method

* Rename methods (hail consistency!)

* Uppercases first letter of the logs everywhere

* Moves method definitions around to more appropriate places

Fixes #18295

Ref #17771
Fixes #18106

If wildcards are in the quotes they not going to be expanded

* Auth: consistently return same basic auth errors

* Put repeated errors in consts and return only those consts as error strings

* Add tests for errors basic auth cases and moves tests to separate test-case.
  Also names test cases consistently

* Add more error logs and makes their messages consistent

* A bit of code style

* Add additional test helper

* Auth: do not expose even incorrect password

* Auth: address review comments

Use `Debug` for the cases when it's an user error

Closes #18037