[!!!][TASK] Remove deprecated Extbase-related code (Part 3)

* public static method in ActionController
* public method in Argument
* public method in Arguments
* class AbstractValidatorTestcase
* legacy location of settings.view.formatToPageTypeMapping

Releases: master
Resolves: #87268
Change-Id: Ieacc247e2ee85b088c01ae9d6d79691df319b333
Reviewed-on: https://review.typo3.org/59273


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>