[TASK] Doctrine: Migrate admin_get_tables in AbstractUpdate

Migrate AbstractUpdate

Resolves: #77731
Releases: master
Change-Id: I23f74693513ffbc62e9b84ef519ffc01acf4dd72
Reviewed-on: https://review.typo3.org/49700


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