Issue #3608762: Add Drupal 12 compatibility, enable next-major CI testing and improve test coverage

Frank Mablyrequested to merge
issue/external_link_a11y-3608762:3608762-add-drupal-12 into 1.x

Closes #3608762

Summary

  • Enable OPT_IN_TEST_NEXT_MAJOR in .gitlab-ci.yml so the pipeline tests against the next major version (Drupal 12).
  • Add ^12 to core_version_requirement, now backed by the next-major CI job rather than only a static Rector scan.
  • Add kernel test coverage for the field formatter (ExternalLinkA11yFormatter), which previously had none: target="_blank" added to external links by default, omitted when add_target_blank is disabled, rel="noopener" added for new-window links, and internal links left unaffected.

Testing

All kernel tests pass locally on Drupal 11 (12 tests, 40 assertions). The next-major job in this MR's pipeline is what verifies Drupal 12.

Supersedes the Project Update Bot issue #3598063 / MR !7, which only widened core_version_requirement without tests or an actual next-major CI run.

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