add magic loop check to speed up task execution

[jlaneve]

Description

This PR adds logic to not parse a DAG unless it's in the parse context. This is called out by Airflow's docs as a nice method to improve task efficiency, because you don't require the worker to re-parse all DAGs.

Related Issue(s)

Breaking Change?

Checklist

• I have made corresponding changes to the documentation (if required)
• I have added tests that prove my fix is effective or that my feature works

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[tatiana]

This PR is stale because it has been open for 6 months with no activity - please, feel free to reopen or create a new one if you'd like to resume the work!