SQLStore: Ensure that sessions are always closed (#55864)

* SQLStore: Ensure that sessions are always closed

Delete `NewSession()` in favour of `WithDbSession()`

* Add WithDbSessionForceNewSession to the interface

* Apply suggestions from code review

pkg/services/secrets/database/database.go

@@ -126,7 +126,9 @@ func (ss *SecretsStoreImpl) ReEncryptDataKeys(
 	currProvider secrets.ProviderID,
 ) error {
 	keys := make([]*secrets.DataKey, 0)
-	if err := ss.sqlStore.NewSession(ctx).Table(dataKeysTable).Find(&keys); err != nil {
+	if err := ss.sqlStore.WithDbSession(ctx, func(sess *sqlstore.DBSession) error {
+		return sess.Table(dataKeysTable).Find(&keys)
+	}); err != nil {
 		return err
 	}