[TASK] Move workspace-related methods to DataHandler

Some methods which do not have any connection
to the current backend user and are only
used in DataHandler and DataHandlerHook of
workspaces are moved to DataHandler in order
to clean up the usages regarding permission
handling of backend users within workspaces.

Resolves: #94744
Releases: master
Change-Id: I0473fe195d267fdb09440ab981ea2550f428d0b0
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70199


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>