fix(ingest/airflow): Add log to dag emit

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.
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