[Twig][Form] Moved twig.form.resources to a higher level

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | #11296
| License       | MIT
| Doc PR        | In progress...
Thanks for the hint, I just had to do that in `validate()` method because it has to happen after xml normalization.