[BUGFIX] Do not convert additional attributes

Additional attributes of contect menu items
should not be converted by htmlspecialchars(),
because they will be escaped on returning the
JsonResponse, due to the used flags and are
additionally set using the DOM API.

Resolves: #102441
Resolves: #102458
Releases: main, 12.4
Change-Id: I1c7ded2dfaa3d0618b7e4beef7bb8ca58b84e984
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81865


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