EDIT

#5009 Add delete handler / operation for polytomous key view with corresponding test class

Move xml validation to base test class

Remove manual session creation and re-enable failing tests

Ignore failing tests to check if other tests fail

Add logs to debug test issue on integration jenkins

Fix test by making sure that all entities are loaded in sessions

Remove unnecessary call to session debugger

#5034 Add tests for handler / operations architecture

Fix test

Fix LanguageString issue with test data

Add log4j extras to apply expression filters