Allow running airflow against sqlite in-memory DB for tests #37144
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This makes no sense for production workloads, but it is useful for
writing tests of Airflow operators etc.
I also moved the warning from configure_vars to convigure_orm so that it
is checked after local settings have been applied in case that changes
anything.
Related to #36774 which was released in 2.8.1 -- prior to that this worked without problem