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/preference/prefimpl/sqlx_store_test.go

@@ -3,11 +3,11 @@ package prefimpl
 import (
 	"testing"
 
-	"github.com/grafana/grafana/pkg/services/sqlstore"
+	"github.com/grafana/grafana/pkg/infra/db"
 )
 
 func TestIntegrationSQLxPreferencesDataAccess(t *testing.T) {
-	testIntegrationPreferencesDataAccess(t, func(ss *sqlstore.SQLStore) store {
+	testIntegrationPreferencesDataAccess(t, func(ss db.DB) store {
 		return &sqlxStore{sess: ss.GetSqlxSession()}
 	})
 }