[TASK] Migrate lowlevel command for workspace cleanup

The workspace-related CLI command is moved to EXT:workspaces.

This way, an unneeded "isLoaded" check gets removed - and the command
only makes sense with workspaces enabled.

Resolves: #82653
Releases: master
Change-Id: Ifb1f069d8222d86be637bd2d182536310a88db3c
Reviewed-on: https://review.typo3.org/54265


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>