fix(autofix): fall back to code mappings but don't add to preference

[srest2021]

No description provided.

[github-actions]

Backend Test Failures

Failures on 9d42e3b in this run:

tests/sentry/seer/autofix/test_autofix.py::TestTriggerAutofix::test_trigger_autofix_passes_resolved_preference — log

[gw0] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/sentry/seer/autofix/test_autofix.py:965: in test_trigger_autofix_passes_resolved_preference
    assert len(call_kwargs["repos"]) == 1
E   assert 0 == 1
E    +  where 0 = len([])

tests/sentry/seer/endpoints/test_group_ai_autofix.py::GroupAutofixEndpointTest::test_ai_autofix_post_endpoint — log

[gw0] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/sentry/seer/endpoints/test_group_ai_autofix.py:384: in test_ai_autofix_post_endpoint
    assert any(
E   assert False
E    +  where False = any(<generator object GroupAutofixEndpointTest.test_ai_autofix_post_endpoint.<locals>.<genexpr> at 0x7fb51a1cb100>)

tests/sentry/seer/endpoints/test_group_ai_autofix.py::GroupAutofixEndpointTest::test_ai_autofix_post_without_event_id — log

[gw0] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/sentry/seer/endpoints/test_group_ai_autofix.py:546: in test_ai_autofix_post_without_event_id
    assert any(
E   assert False
E    +  where False = any(<generator object GroupAutofixEndpointTest.test_ai_autofix_post_without_event_id.<locals>.<genexpr> at 0x7fb519bc85e0>)

tests/sentry/seer/endpoints/test_group_ai_autofix.py::GroupAutofixEndpointTest::test_ai_autofix_post_without_event_id_no_recommended_event — log

[gw0] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/sentry/seer/endpoints/test_group_ai_autofix.py:637: in test_ai_autofix_post_without_event_id_no_recommended_event
    assert any(
E   assert False
E    +  where False = any(<generator object GroupAutofixEndpointTest.test_ai_autofix_post_without_event_id_no_recommended_event.<locals>.<genexpr> at 0x7fb51b8d07c0>)