[TASK] Cleanup unneeded database columns

Remove unused column 'tablenames' from mm tables

Resolves: #58146
Change-Id: I7f268a3194a6e8d58e2c61033a493c46f8f81c00
Reviewed-on: https://review.typo3.org/29629
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer