Revert "[BUGFIX] Frontend Login not added to CSC anymore"

This reverts commit 373a90b8600e37c0c70d3b0771d18385eca3f961

Benni is working on a better solution to the problem.

Related: #55557
Change-Id: I749ea9beb3879d7503294a51107a4a3855f0105e
Reviewed-on: https://review.typo3.org/27319
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny