[TASK] Add expressive API to ProcessingRule class

As a followup to #96424, expressive API is introduced
and covered with unit tests, to better convey the
intention in the places it is used.

Resolves: #96424
Releases: main, 11.5
Change-Id: I9596e2269b891042cbb03ccbedfcbc086f2897ee
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73711


Tested-by: core-ci <typo3@b13.com>
Tested-by: waldhacker <hello@waldhacker.dev>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: waldhacker <hello@waldhacker.dev>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>