feat(airflow): upgrade airflow to 2.6.0

[davidspek]

Summary

This PR upgrade airflow to use the latest version (2.6.0) using our new automated image building pipeline so we can keep it up to date more easily. It also allows for users to use Plural deployed Redis rather than the chart internal redis.

Test Plan

Local linking. Upgrading on existing cluster and deploying a new cluster to check the upgrade.

Checklist

• No images hosted from dockerhub
• Are dashboards present to understand the health of the application. There must be at least 1 of these
  • all databases should have dashboards
  • ideally also have at least cpu/mem utilization dashboards for webserver tier of the app
  • you can use plural from-grafana to convert a grafana dashboard found via google to our CRD
• Are scaling runbooks present
  • all databases must have scaling runbooks
  • you can use the charts in pluralsh/module-library to accelerate this
• do you need to add config overlays?
  • inputing secrets
  • configuring autoscaling
• If there’s a web-facing component to the app, we need to support OIDC authentication and setting up private networks if no authentication option is viable
• All major clouds must be supported
  • Azure
  • AWS
  • GCP

[rauerhans]

lgtm

[plural-bot]

🎉 This PR is included in version 1.0.0 🎉

The release is available on GitHub release

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