Issue #3215110: Expand test coverage

This contains a test which covers Taxonomy Attach behaviour (where a node is not in the menu breadcrumb, but has a relationship to a parent term which is), and some other misc behaviour.

Will merge if these pass so it's easier for other contributions to use those tests and the base class as start points.

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• 9b35bb36 - Issue #3215110: Expand test coverage

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• 9c900e72 - Issue #3215110: Expand test coverage

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approved this merge request

enabled automatic add to merge train when the pipeline for f7cbe5c1 succeeds

Merging this with what's available so that the tests, and particularly the base test class, are available for others (eg [#3269452] and similar).

started a merge train

merged