Configurable activity and project number (#4729)

* added configurable activity number
* added configurable project number
* fix deprecations
* added some tests for entity exporter
* better configuration of dropdown pattern for customer, project and activity

src/Repository/ActivityRepository.php

@@ -353,7 +353,7 @@ class ActivityRepository extends EntityRepository
      */
     private function getSearchableFields(): array
     {
-        return ['a.name', 'a.comment'];
+        return ['a.name', 'a.comment', 'a.number'];
     }
 
     public function countActivitiesForQuery(ActivityQuery $query): int