Auto stop review app environments
What does this MR do?
This sets an expiry on review app environments. In the past, review environments were never cleaned up, but after gitlab-foss!31464 (merged), deployed review apps are being cleaned up.
If review app is never deployed, the cleanup job is never called, and the environment sticks around forever. Adding this auto_stop_in
will fix this, so that nothing will stagnate any more, and 2 weeks should be more than enough time for review. If more time is needed, we can re-run the pipeline.