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/Form/Helper/CustomerHelper.php

@@ -23,7 +23,7 @@ final class CustomerHelper
 
     private ?string $pattern = null;
 
-    public function __construct(private SystemConfiguration $configuration)
+    public function __construct(private readonly SystemConfiguration $configuration)
     {
     }