test: #3619084 Cover the anchors a format without the Anchor button must keep

Issue: https://www.drupal.org/project/anchor_link/issues/3619084

#3619043 fixed a Major defect where a format without the Anchor button lost id and name off its anchors. A unit test covers the plugin definition shape, but nothing drove the behaviour, so the regression could return silently.

Changes

• New format in the test recipe: no_anchor_test — CKEditor 5, General HTML Support (no filter_html), toolbar without the Anchor button. Added to the recipe's strict list alongside the existing two.
• New scenario 03-01-03-anchor-outside-the-plugin.feature: writes <a id> and <a name> into that format, asserts both survive the editor, saves, and asserts the id reaches the rendered page.
• The format-switch step waits for a different instance, not for the Anchor plugin. A format under test may deliberately lack that plugin, so the plugin-specific wait added in #3619046 cannot serve this scenario — and distinguishing the incoming instance from the outgoing one is the more accurate fix for the race it was written for.

Testing

node --check clean; recipe and config YAML valid. The behaviour itself was verified by hand in a browser on Drupal 10.6, Drupal 11.4 and Varbase 9.2 / 10.1 / 11.0 before and after the #3619043 fix — this MR is what stops it needing to be verified by hand again.

Checkpoints:

• File an issue
• Addition/Change/Update/Fix
• Testing to ensure no regression
• Automated unit testing coverage
• Automated functional testing coverage
• UX/UI designer responsibilities
• Readability
• Accessibility
• Performance
• Security
• Developer Documentation
• User Guide Documentation
• Reviewed by human
• Code review by maintainers
• Full testing and approval
• Credit contributors
• Review with the product owner
• Release notes snippet
• Release

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