[TASK] Add MM-related DataHandler tests

This change adds the status quo for further MM-related work.

This relates to some tests that had tests on
"allowLanguageSynchronization" but not "l10n_mode=exclude" set.

In addition, some MM-related tests were not added to all workspace-*
tests anymore, which are now added:

* copyContentToLanguageOfRelation
* copyCategoryToLanguageOfRelation
* localizeContentOfRelationWithLanguageExclude
* localizeContentOfRelationAndAddCategoryWithLanguageSynchronization

Resolves: #101285
Related: #80640
Releases: main, 12.4
Change-Id: Ib675b9bc263d519372a8028370db581e25a49edf
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79864


Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>