[!!!][TASK] Remove deprecated backendCheckLogin argument

Resolves: #96392
Related: #95320
Releases: main
Change-Id: I6dfe1e5ea95c1e5ceb748e2b1c50eec8644f1ecf
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72732


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>