[TASK] Rename PageParameterValidator middleware

In order to be in line with the new PageArguments object,
this newly introduced class is now renamed.

Resolves: #86431
Releases: master
Change-Id: I96575338538641fc27a578c49868b21100b61ed3
Reviewed-on: https://review.typo3.org/58446


Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>