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. 😅

This is a pure test coverage addition, so I feel comfortable merging this. 👍

      cy:command ✔  assert	expected **<input#edit-path-0-alias.rt-reset.rt-TextFieldInput.form-text>** to have value **/not-empty-anymore**
                    Actual: 	"/not-empty-anymore"
                    Expected: 	"/not-empty-anymore"
      cy:command ✘  wait	@updatePreview

— https://git.drupalcode.org/project/experience_builder/-/jobs/5099609

Retrying: https://git.drupalcode.org/project/experience_builder/-/jobs/5099646

This is failing too often to merge 😬

Root cause found: #3518313-18: Add e2e tests for boolean checkbox in page data form → 🙈 Queuing a new pipeline…

Automatically closed - issue fixed for 2 weeks with no activity.