Bruno Antonellini

Fix GitHub action

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EDIT: See below

DCV-2432 change custom_callbacks to notifications using Airflow Notifiers

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This PR changes the `custom_callbacks` YML-dag structure for a `notifiers` one based on newer [Airflow Notifiers](https://airflow.apache.org/docs/apache-airflow/2.6.0/howto/notifications.html#using-a-notifier)

Datacoves' dbt-core-interface improvements + new response

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- Various dbt-core-interface improvements in terms of code clarity. - Added response when .sqlfluff file is broken (Unfixable, unlintable)

Fixes #259 fixes #258