Implement backoff's for card_creation tasks

[adhil0]

https://docs.celeryq.dev/en/stable/userguide/tasks.html#Task.retry_backoff

[adhil0]

More details: it looks like whenever our redis pod goes down, our celery pods don't reconnect to redis, even after the redis pod is back up and running. maybe this will help: https://groups.google.com/g/celery-users/c/2-hpG4qyulk