[TASK] Rename method inside PageLayoutController

Give the actual method the name "generateMessagesForCurrentPage"
as no flash messages are generated.

Resolves: #93428
Releases: master
Change-Id: I1c0c9e721a012fab2942133637fcd8513571d03c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71487


Reviewed-by: Sybille Peters <sypets@gmx.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>