Add e2e tests for path widget in page data form

Actually, the e2e test has a legitimate server-side fail.

AFAICT 📌 Add e2e tests for moderation state in page data form Active interferes with this, because we're seeing

You can only change the URL alias for the <em>published</em> version of this content.

which is why the e2e test fails, triggered by \Drupal\path\Plugin\Validation\Constraint\PathAliasConstraintValidator::validate(), because the non-default revision is being saved. 😅