Remove cancel_redundant_pipelines from CherryPick service
6121d53e - Remove cancel_redundant_pipelines from CherryPick service
When the service was running this, timing issues meant that not all of the pipelines it would cancel had been created yet.
We'll move this to after the cherry-pick completes, in the Rake task.
6aa965c2 - Cancel redundant pipelines after a delay
This also moves the feature behind a real feature flag, rather than an environment variable as it was previously.