[TASK] Make file_upload.php dispatched

Use dispatching for file_upload.php

Resolves: #61217
Releases: 6.3
Change-Id: I82adcc68e6583628255ac8442f4d5b24389a195f
Reviewed-on: http://review.typo3.org/32407
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Alexander Opitz <opitz.alexander@googlemail.com>
Tested-by: Alexander Opitz <opitz.alexander@googlemail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>