[!!!][TASK] Doctrine: Remove ext:adodb

Extension adodb has been moved to TER and can be
loaded with an upgrade wizard provided by the
ext:dbal removal patch.

Change-Id: I4b6cef864ef368059b49097abefd21e2175b99c2
Resolves: #77761
Releases: master
Reviewed-on: https://review.typo3.org/49730


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>