[BUGFIX] Avoid fatal errors in Admin Panel

The functionality to display / explain DB select queries does not
work with DBAL and doctrine anymore.

The leftovers in admin panel caused a fatal PHP error due to a missing
method, which was now removed.

Resolves: #78375
Releases: master
Change-Id: I5cc69508f82855985d3f78449a4672952c633f63
Reviewed-on: https://review.typo3.org/50291


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>