[TASK] Limit GET/POST requests of PersistentStorage

This change limits the GET request for the PersistentStorage
to only "get" and "getAll", where as the others are only working
for "post".

Since this logic is encapsulated properly in the Persistent
JavaScript API, no other parts are affected.

Resolves: #93948
Releases: master
Change-Id: I965ea4552671c743cabed10c4cd8ad7275532420
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68715


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>