Revert "[TASK] No reference index for workspace delete placeholders"

This reverts commit 84948b2c.

The strategy to not have reference index entries for
workspace delete placeholders does not work out (for now):

* Workspace ElementEntity class relies on it and is
  used by DataHandler during workspace operations.

* Patch was incomplete: While rows 'from' affected
  records were dropped in refindex, rows 'to' affected
  records were left.

We may later pick this up again, but need more refactoring.

Change-Id: I19b36d011b3cae2c3c17763ace8e5ff22f8dfe9b
Resolves: #93285
Reverts: #93274
Releases: master
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67413


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>