[TASK] Move redirect to shortcut and mount point to middleware

Instead of using HttpUtility to redirect and exit the program
flow, we now return a proper redirect response in a middleware.

Resolves: #84946
Releases: master
Change-Id: I397790ea1d46ae46ef41bd9c2f03f3aac079d1a4
Reviewed-on: https://review.typo3.org/56886


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>