Allow AJAX dialogs to disable refocus when content is added

The Needs Review Queue Bot → tested this issue. It either no longer applies to Drupal core, or fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

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Attached patch against Drupal 10.1.x

This will need test coverage.

This appears to be fixed because of 🐛 Dialog focus is returned to dialog instead of first tabbable element on dialog AJAX update Fixed which changed exactly these lines of code. If you can still reproduce please reopen.