feat: Upgrade Airflow from 2.7.3 to 2.8.2

[sean-rose]

Some notable updates:

• 2.8.0
  • Raw HTML code in DAG docs and DAG params descriptions is disabled by default (#35460)
  • Add ability to clear downstream tis in "List Task Instances" view (#34529)
  • Add multiselect to run state in grid view (#35403)
  • Remove version top-level element from docker compose files (#33831)
  • Enable overscroll on the DAG Grid page (#35717)
  • Add borderWidthRight to grid for Firefox scrollbar (#35346)
• 2.8.1
  • Target version for core dependency pendulum package set to 3 (#36281)
  • Airflow packaging specification follows modern Python packaging standards (#36537)
  • Redirect to index when user does not have permission to access a page (#36623)
• 2.8.2
  • Allow pre-population of trigger form values via URL parameters (#37497)
  • Revoking audit_log permission from all users except admin (#37501)

[mikaeld]

Approved pending dev/stage tests

[sean-rose]

With this PR deployed to staging I successfully tested the following DAGs in staging:

• clean-gke-pods (GKE pod operator)
• bqetl_cjms_nonprod (Fivetran operators, bigquery-etl operators)
• bqetl_google_search_console (BigQuery sensors, bigquery-etl operators)

I'm proceeding with merging this PR, tagging a release, and deploying it to production.