[TASK] Remove TCA MM_hasUidField

MM tables only need a uid column when "multiple" is true.

With primary keys finally being properly set on MM
relations without "multiple", we can remove "MM_hasUidField"
and derive the information whether a uid column is needed
from "multiple" flag, which obsoletes "MM_hasUidField".

Resolves: #101554
Related: #101425
Releases: main
Change-Id: I2b39da902d2a6a8a85b840daa813a2af712bfd82
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80434


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>