[WIP][BUGFIX] Invalid relations of IRRE records in workspaces

* general -> always use live id as pointer value
* create records -> automatically fill placeholder pointers
* copy records -> currently leads to problems with sorting
* move records -> follow and create child move placeholders
  Add new TCA control section property for placeholder values:
  $TCA[<table>]['ctrl']['shadowColumnsForMovePlaceholders']
* delete records -> forward delete data in copy(!) process

Resolves: #56376
Releases: 6.2
Change-Id: I75248d10b000de73ca623770f07e8c2e89d4cdd8
[WIP][TASK] Add Publish and PublishAll DataHandler workspaces tests

Change-Id: I1f7a70df39585c29b3b4ff5675b5147610f254f2
Releases: 6.2