Added: 1. Python code coverage collection

[epatotski]

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.24%. Comparing base (ad6eb84) to head (d2fb6ba).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #294      +/-   ##
==========================================
- Coverage   75.07%   72.24%   -2.83%     
==========================================
  Files         597      597              
  Lines       58590    58590              
==========================================
- Hits        43984    42331    -1653     
- Misses      14606    16259    +1653     

Flag	Coverage Δ
airflow	64.52% <ø> (ø)
airflow-plugin-v1	40.87% <ø> (ø)
airflow-plugin-v2	56.67% <ø> (ø)
prefect	87.10% <ø> (ø)
prefect-	87.10% <ø> (ø)
pytest-testIntegrationBatch0	60.69% <ø> (-0.01%)	⬇️
pytest-testIntegrationBatch1	?
pytest-testIntegrationBatch2	42.76% <ø> (-0.14%)	⬇️
pytest-testQuick	46.18% <ø> (ø)
test-airflow24	55.33% <ø> (ø)

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