[TASK] Doctrine: Migrate ext:rtehtmlarea

Resolves: #77200
Releases: master
Change-Id: Ib889c5b467cb43172a5340e4d872b7de2959a1eb
Reviewed-on: https://review.typo3.org/49155


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>