[TASK] Add namespacing where missing

Resolves: #47200
Releases: 6.1
Change-Id: I29c1323bc53c437ab6631f735c90f7ddbe73f043
Reviewed-on: https://review.typo3.org/19950
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn