[BUGFIX] Optimize drag&drop of folders in the UI

Allow a user to move a folder into a folder on the same
level and prevent moving a folder into its child folder.

Resolves: #93954
Releases: master
Change-Id: I444a87e862075ecd0a3e54ce5afd02314b1931c0
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68833


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>