[TASK] Avoid ObjectManager in remaining ext:form places

Finish ObjectManager removal / fallback works in
ext:form. The validators are no issue since they
have been postulated of not being autowire DI
aware in v11.0 with #92238 already, so we can
follow this.

Resolves: #94384
Related: #90803
Related: #92238
Releases: master
Change-Id: I1115d2eaa595fa5685f6549843b4f388d5d07c98
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69525


Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>