[TASK] Avoid ObjectManager for ext:form ProcessingRule

Inject a singleton service, makeInstance() prototypes.

Resolves: #94304
Related: #90803
Releases: master
Change-Id: I0645c06a5f5ae2b10f5e14aee08ed01f16720bac
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69455


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>