Update HITL test to use new column name for HITLdetail table

[amoghrajesh]

Fixes CI error:

ERROR airflow-core/tests/unit/api_fastapi/core_api/routes/ui/test_dags.py::TestGetDagRuns::test_should_return_200_with_hitl[None-3-None] - TypeError: 'user_id' is an invalid keyword argument for HITLDetail
ERROR airflow-core/tests/unit/api_fastapi/core_api/routes/ui/test_dags.py::TestGetDagRuns::test_should_return_200_with_hitl[True-1-expected_pending_actions1] - TypeError: 'user_id' is an invalid keyword argument for HITLDetail

Example: https://github.com/apache/airflow/actions/runs/17422273432/job/49463258874

Probably caused because #55041 was merged 14 hrs ago and #55019 didn't rebase prior to merge.

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