[!!!][TASK] Remove TCA config MM_insert_fields

Resolves: #101009
Related: #100963
Related: #100335
Releases: main
Change-Id: I6400ec35c0140ab238c895bf604048bbc642b4eb
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79271


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>