[TASK] Use general functionality for fetching templates

Some places in the TYPO3 Core can use the general coding functionality
to fetch absolute URLs, but "GeneralUtility::getFileAbsFileName" should
be used in these places.

Resolves: #83084
Releases: master
Change-Id: Ic723060b4b01eac51256d54e619a7770e0ad65fa
Reviewed-on: https://review.typo3.org/54753


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>