Timeseries: Time regions migration

[adela-almasan]

Updated migrations to include time regions. Time regions PR needs to be merged first.

Check: http://localhost:3000/d/XMjIZPmik/panel-tests-graph-time-regions?orgId=1&from=now-30d&to=now&__feature.autoMigrateOldPanels=true

Fixes #66997

TO DO:

• auto refresh dashboard?

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.

[nmarrs]

code changes LGTM - will want to test again after blocking PR is merged

[ryantxu]

@dprokop @torkelo -- any suggestions on how to trigger the annotations to rerun. This was my hack, but not working consistently

[torkelo]

@ryantxu the problem here is that this will be triggered multiple times if you have many panels with time regions on dashboard. So maybe need some kind of debounce function for this. But ideally it should only retrigger annotations. Think it could be better if this was something like (But still need to figure out the debounce), the other problem I guess is that when loading a dashboard this is kind of too late. The annotation queries might already be running. Is there a way to do these migrations in the DahboardMigrator instead so they happen before dashboard is initialized and annotation queries are issued?

getDashboardQueryRunner().run({dashboard, range: getTimeSrv().getTimeRange()}

[ryantxu]

thanks! that works -- we only trigger one refresh 1/4 sec after load