chore: remove sqlstore & mockstore dependencies from (most) packages (#57087)

* chore: add alias for InitTestDB and Session

Adds an alias for the sqlstore InitTestDB and Session, and updates tests using these to reduce dependencies on the sqlstore.Store.

* next pass of removing sqlstore imports
* last little bit
* remove mockstore where possible

pkg/services/temp_user/tempuserimpl/temp_user.go

@@ -3,8 +3,8 @@ package tempuserimpl
 import (
 	"context"
 
+	"github.com/grafana/grafana/pkg/infra/db"
 	"github.com/grafana/grafana/pkg/models"
-	"github.com/grafana/grafana/pkg/services/sqlstore/db"
 	tempuser "github.com/grafana/grafana/pkg/services/temp_user"
 )