[TASK] Enable tablecaption in CKEditor5

CKEditor5 renders tablecaptions as figcaption elements,
therefore we allow them to be included in RTE and
in frontend rendering.

Resolves: #101874
Releases: main, 12.4
Change-Id: I0d1c05b2d8a35d765e64713741a0ab05a5aa1a5c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82187


Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benjamin Franzke <ben@bnf.dev>