[v9.0.x] Auth: Case insensitive ids duplicate usagestats (#51240)

* merged and backport to 9.0

* implement the missing method GetDialect for sqlStore

* Add back mockstore missing methods

pkg/services/sqlstore/sqlstore.go

@@ -157,6 +157,11 @@ func (ss *SQLStore) Quote(value string) string {
 	return ss.engine.Quote(value)
 }
 
+// GetDialect retrieves the dialect of the current SQL engine
+func (ss *SQLStore) GetDialect() migrator.Dialect {
+	return ss.Dialect
+}
+
 func (ss *SQLStore) ensureMainOrgAndAdminUser() error {
 	ctx := context.Background()
 	err := ss.WithTransactionalDbSession(ctx, func(sess *DBSession) error {