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9b5cfdf1 - Celery: use `on_retry` to handle `BuildMaxConcurrencyError`

Celery: use `on_retry` to handle `BuildMaxConcurrencyError` Instead of handling the retry of a task manually when the project hits max concurrency error, we rely on Celey handlers to do it for us. By raising the any of the exceptions defined in `autoretry_for`, Celery will call `on_retry` automatically. There, inside `on_retry` we handle the particular case for `BuildMaxConcurrencyError` by setting the error into the build object and skipping the test to continue running. See https://docs.celeryproject.org/en/master/userguide/tasks.html#automatic-retry-for-known-exceptions and https://docs.celeryproject.org/en/master/userguide/tasks.html#Task.autoretry_for