Remove concurrency and timeout from sidekiq_queues.yml

These values are already set in environment variables and passed on the command line. Having them on the command line and in the configuration file isn't necessary.

https://gitlab.com/gitlab-org/build/CNG/-/blob/master/gitlab-sidekiq/scripts/process-wrapper

In order to have concurrency actually overridable globally, we need to stop defining it for the all-in-1 pod and just define it globally. This means that the new global default is 25, which should be OK per !595 (merged).