ci: #3610733 Test next Drupal major

Jacob Rockowitzrequested to merge
issue/schemadotorg-3610733:3610733-support-drupal-11-x into 1.0.x

Summary

  • Keeps the primary GitLab CI composer job on Drupal 10.5.x-dev.
  • Enables OPT_IN_TEST_NEXT_MAJOR so DrupalCI also tests the next major line, Drupal 11.x.

Closes #3610733

AI-Generated: Yes (Used Codex to inspect the repository, update .gitlab-ci.yml, run local verification, create the Drupal.org issue, and prepare this MR.)

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