Shows info that no alerts are found for the currently selected interval in Alertlist.
Fixes #9624

* add __timeGroup macro for mysql

* put example __timeGroup query in frontend help

* do __timeGroup interval parsing in go similar to mysql

* ignore whitespace around interval

* converted dashboard_loaders.js to .ts

* class name change

prometheus: fixed unsaved changes warning when changing time range due to step option on query model was changed in datasource.query code, fixes #9675

datasources: change to optimistic concurrency

fixes #9643

Fix typo in template help tab

ref #9030

* Allow for multiple auto interval template variables without them overwriting each other's value.

* Add test for multiple auto interval template variables.

* Correctly handle old links with .

closes #9645

Update development.md