[TASK] Cleanup for ClassNamingUtility

Small cleanups for the new feature
which just got merged.

Releases: 6.1
Fixes: #43052
Change-Id: I9c7df202f7e63c148f35fefe30e134b0a299b124
Reviewed-on: https://review.typo3.org/18189
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring
[TASK] Clean up data submission handling

The patch encapsulates the data submission that can feed
DataSubmissionController from index_ts to
TypoScriptFrontendController.

Change-Id: I3d357f97f77db5e675f4ec446fc3015214e372a2
Resolves: #47158
Related: #47157
Releases: 6.1
Reviewed-on: https://review.typo3.org/19826
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Thomas Maroschik
Tested-by: Thomas Maroschik
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn