[TASK] Show full readable path of allowedFileMounts

The label of the select field 'allowedFileMounts' in the form
wizard has been optimized. Now, the label is more readable and
less technical.

Resolves: #91627
Releases: master
Change-Id: Iee18a47901a6d1c63184c68d5c4a888c3d4f0e15
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70540


Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Steiger <typo3@andreassteiger.de>
Tested-by: waldhacker <hello@waldhacker.dev>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Andreas Steiger <typo3@andreassteiger.de>
Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Reviewed-by: waldhacker <hello@waldhacker.dev>