[!!!][TASK] Remove PdoBackend cache backend

Resolves: #96114
Related: #94664
Releases: master
Change-Id: I6ada8e2b4249f2f38cdab2b1074333d8ac8e03d7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72335


Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Benni Mack <benni@typo3.org>