Identify ponos task containers

Refs https://support.teklia.com/t/workers-sexecutant-dans-une-infra-docker-separee-de-linstance-arkindex/73

Similary to ponos-agent in EE, we should name consistently all the docker containers created by the RQ ponos agent.

Each new container should be named as ponos-{task.id}

If a task with the same name already exists, raise an exception early (it should not happen with new restart mode)