[BUGFIX] Recreate processig folder without permission checks

When fetching the processing folder and it does not
exist, it is created on the fly. This should be done
without checking permissions. However by making
storage 0 not browsable, permissions will be checked
when fetching subfolders.

Instead we now fetch the folder objects directly
from the driver, where no permission checks are done.

Resolves: #51747
Releases: 6.0, 6.1, 6.2
Change-Id: I1a4c3b183323151c436969a478c669adb3856476
Reviewed-on: https://review.typo3.org/23656
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel