[!!!][TASK] Remove unused configuration settings

The patch drops some unused pre-doctrine DB related TYPO3_CONF_VARS.

Change-Id: I9204ef926b1de145f541e2c84dadc6a968e153b9
Resolves: #82421
Releases: master
Reviewed-on: https://review.typo3.org/54077


Reviewed-by: Jan Helke <typo3@helke.de>
Tested-by: Jan Helke <typo3@helke.de>
Reviewed-by: Joerg Kummer <typo3@enobe.de>
Tested-by: Joerg Kummer <typo3@enobe.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: TYPO3com <no-reply@typo3.com>