[AIRFLOW-5463] Use same session to delete and add variable in set #6807
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Why:
resulting in the variable being deleted. The intention of this change is
that an error should leave the variable unchanged.
https://issues.apache.org/jira/browse/AIRFLOW-5463
Tests
I was unable to see a good way to test this, is there a way to make delete succeed and add error? You could consider it a refactoring since the variable tests continue to pass.