[TASK] Add functional tests for versioned MM references

Functional tests are integrated to simulate editing MM references
in a workspace context, however with submitting the live uids of
the accordant entities to be referenced.

Resolves: #77384
Releases: master, 7.6
Change-Id: I207f20ff4ac7d041a353e5d250f9283b0e62e591
Reviewed-on: https://review.typo3.org/49349


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>