fix(templating): fixed issue with nested template variables and multi select, the child variable selection state is now updated like single select variables, so if none matches the first option is selected, fixes #4861

Conflicts:
	package.json

Commit adds missing option `Read-Only Editor` to `auto_assign_org_role` description.

Conflicts:
	pkg/api/frontendsettings.go

Conflicts:
	package.json

fix(panel span): fixed issue setting panel span while in fullscren and also an issue when changing repeat variable while in fullscreen view, fixes #4957

Fixes #5109

* (prometheus) support new legend format (with backward compatibility)

* (prometheus) use regex replace for legend format

* (prometheus) allow white space