Remove concurrency problem in no-db tests and mock by late import #43942
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Fix for errors in https://github.com/apache/airflow/actions/runs/11798339919
Assumed root casue - only 90% certain: Concurrency in pytest with xdist.
I was able to fix it with not seeing the error locally by making imports late - seems if a top level import is made befor the mock, the
execute_in_subprocess
call was not correctly mocked... whyever.