[TASK] Sanitize embedded HTML in Installation-Wide Configuration GUI

Input data is statically provided by EXT:core only, so there is no
security issue known right now. This change is a preparation to avoid
possible future security issues.

Resolves: #102676
Releases: main, 12.4, 11.5
Change-Id: I49a7fdd250e8ce74fdde07ad305cbae7e4af8ec3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82252


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>