refactored repositories and DB queries (#5026)

* removed unused teams from export order
* added new paginator for query instead of querybuilder
* added field hydrate enums
* hide PARTIAL deprecation
* never log deprecations in production
* replaced InvoiceLoader with native Doctrine feature
* prevent excessive permission queries
* support loading customers of team
* improved findByIds
* internalized API
* fix null string deprecations

src/Repository/Query/CustomerQueryHydrate.php

@@ -0,0 +1,16 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Repository\Query;
+
+enum CustomerQueryHydrate
+{
+    case TEAMS;
+    case TEAM_MEMBER;
+}