[TASK] Deprecate FileCollection models

The classes have been marked as internal and never contained any logic.
Therefore and in order to streamline the codebase of Extbase,
the files will be removed with TYPO3 11.0.

Resolves: #90692
Releases: master
Change-Id: I12398224f729672d6503285ba7d7e9dd10de1d18
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63641


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>