What this PR does / why we need it:

tests/unit/audit/test_mcp_audit_handler.py fails on master depending on test ordering (e.g. on PR #6789, all Python versions): RuntimeError: There is no current event loop in thread 'MainThread'.

• Its _run helper uses asyncio.get_event_loop(), which raises once a previous test on the same xdist worker has called asyncio.run() (which unsets the loop), as test_precomputed_feature_vectors.py now does since ce37029.
• Switch the helper to asyncio.run(coro) so the tests no longer depend on a leftover event loop.

Reproduce on master: pytest tests/unit/test_precomputed_feature_vectors.py tests/unit/audit/test_mcp_audit_handler.py

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