[TASK] Install Tool: Move common code into abstract class

All modules of the Install Tool used in modal windows now share a common
abstract class that contains some boilerplate code required for most
modules.

Resolves: #88518
Releases: master
Change-Id: I0c2f03f098c731e5a0c499ce91400c22a8c1f890
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60897


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Jonas Eberle <flightvision@googlemail.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Simon Gilli <typo3@gilbertsoft.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>