[WIP] Fix failing tests in 20260621 rollout

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

---

This section details on the original issue you should resolve

<issue_title>Failing tests in 20260621 rollout</issue_title>
<issue_description>the following tests are failing in the new rollout:

• code/ARAX/test/test_ARAX_expand.py::test_issue_2662
• code/ARAX/test/test_ARAX_filter_kg.py::test_warnings
• code/ARAX/test/test_ARAX_overlay.py::test_jaccard
• code/ARAX/test/test_ARAX_overlay.py::test_FET_ex1
• code/ARAX/test/test_ARAX_resultify.py::test_node_binding_query_id_one_hop_single_input_curie
• code/ARAX/test/test_ARAX_resultify.py::test_legacy_subclass_of_handling
• code/ARAX/test/test_ARAX_workflows.py::test_FET_example_1
• code/ARAX/test/test_ARAX_workflows.py::test_FET_example_2
• code/ARAX/test/test_ARAX_workflows.py::test_FET_example_3
• code/ARAX/test/test_ARAX_workflows.py::test_FET_example_4
  </issue_description>
• Closes Failing tests in 20260621 rollout -- Hard code Retriever to CI for now.  #2828

Comments on the Issue (you are @copilot in this section)

@hodgesf Starting with the first one (test_issue_2662) it looks like this is caused by retriever not returning any aux graphs for this query. There is nothing we can do with this.

Open an issue with Willow?
Change the test case to a query that does have aux graphs being returned?
Remove this test all together? </comment_new>