[BUGFIX] Add figure tag to external blocks in rte parsing

Resolves: #99281
Releases: main, 11.5, 10.4
Change-Id: Ic65f08aa0bb67f97880d0ff5bb4c692fe7e6ffde
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76933


Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>