If an image section is included in the JSON payload for MS Teams alerts
when no image URL exists, rendering of the alert in the client fails.
This change makes sure that an image section is only included in the
JSON payload if an image URL exists.

Closes #16082

Adds backend code style guide

Co-Authored-By: bergquist <carl@grafana.com>

Explore: Query row using character refId instead of number

Cleaning up implicit anys in DashboardExporter and tests

Input to grafanaui2

Panels: fix loading panels with non-array targets

Use ora#fail instead of console.log

Add patterns to no-only-tests grunt task

Since with ora#fail you can stderr it instead of using the stdout,
and it's a bit nicer since it will show that cross sign :)

progress: #14714

add startValue to random_walk testdata scenario and random_walk_table

Explore: Fix log stats with long labels

Signed-off-by: Steven Sheehy <ssheehy@firescope.com>

make value processing/formatting more reusable

* grafana/master: (44 commits)
  feature(explore/table): Add tooltips to explore table (#16007)
  Update changelog
  Add check for Env before log
  Update index.md
  chore: Cleaning up implicit anys in manage_dashboard.ts and manage_dashboard.test.ts progress: #14714
  chore: Cleaning up implicit anys in app.ts progress: #14714
  changelog: adds note about closing #15836
  changelog: adds note about closing #6359 and #15931
  add partial
  Add check so that header is not sent for anonymous users
  Update config docs
  Add custom header with grafana user and a config switch for it
  changelog: adds note about closing #10816
  use constants for cache type
  updates old distcache names
  dont allow inifinite expiration
  return error if cache type is invalid
  use `Get` instead of `Find`
  avoid exposing cache client directly
  add docs about remote cache settings
  ...

Longer labels are now viewable as a tooltip in the Explore table

Signed-off-by: Steven Sheehy <ssheehy@firescope.com>

Only log connection string in dev environment

Update index.md