Report Airflow errors to Sentry

Summary:
As Airflow is an automated process, it's probably a good idea
to monitor carefully errors and send them to Sentry.

A custom image installs apache-airflow[sentry] and so sentry-sdk
Python package.

The pillar file services/monitoring-reporting.sls allows
to use credentials.get_sentry_dsn everywhere.

References:

• https://docs.sentry.io/platforms/python/guides/airflow/
• https://airflow.apache.org/docs/apache-airflow/stable/administration-and-deployment/logging-monitoring/errors.html

Ref T1812

Test Plan:

• create new org for external tools in Sentry
• configure integration
• got first issue about triggerer too slow lock

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1812

Differential Revision: https://devcentral.nasqueron.org/D2952