[FEATURE] Add label_userFunc_options support to BackendUtility

This new TCA options should also be available to the only other
place where label_userFunc is evaluate.

Resolves: #49721
Related: #36052
Related: #49716
Releases: 6.2
Change-Id: I3da74e660ad4fc982b9ec71e7d5c5f0f57e9e76a
Reviewed-on: https://review.typo3.org/21985
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer