[BUGFIX] Allow changing FF sections in new version overlays

Creating a version overlay of a record that has flexform
sections and moving or deleting some of these sections
at the same time fails in DataHandler due to a wrong uid
lookup for the section command array.

The patch fixes this scenario in the DataHandler flexform
processing code and leaves an according explanation comment.

Note this v10 backport contains the fix only and skips
the functional tests that have been added with main.

Resolves: #73761
Releases: main, 11.5, 10.4
Change-Id: Ib1c910c59a2ebfe9b7545cabb258f44bac2cd273
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75195


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>