[FOLLOWUP] Provide PSR-7 Request only when relevant

This makes passing the PSR-7 Request to the
PolicyMutatedEvent optional, since there are
use cases where the available request is
not relevant for CSP / the Event. Those
usages are adjusted accordingly.

Resolves: #104141
Releases: main, 12.4
Change-Id: Id4597e26850f42a444a16fe986e2136b6a543075
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84930


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Bartsch <bo@cedev.de>