[BUGFIX] Files with unclean path indexed multiple times

When adding a file or requesting a file by an identifier
cleanup any . and .. in the path before handing off
to the driver so files are not indexed multiple times.

Fixes: #46989
Releases: 6.2, 6.1, 6.0
Change-Id: I4198a8885a6a148e68e1e0f717775f9af976a9ef
Reviewed-on: https://review.typo3.org/22923
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind