[TASK] Remove FileDragProvider

The FileDragProvider was a special provider, only
used in the "legacy" FileList tree. As this tree was
already replaced by the svg tree, the provider is
now removed.

Resolves: #94523
Releases: master
Change-Id: I2536cfe8fd9fbd92704b4cd7ea66c0fb3143d070
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69801


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