[Tunnelbroker] close RabbitMQ queue when client disconnects

Summary:
This might cause issues and was causing error in past:

1. We run persistence test
2. Queue is created, but never closed
3. We run tests again, messages are in database, but are also put into RabbitMQ
4. Consumer receives messages, and try to send but socket is closed at this time
5. It generates error in Tunnelbroker logs

Depends on D9316

Test Plan:

1. Without this changes run:

cd services/commtest && cargo test --test tunnelbroker_persist_tests  -- --nocapture

2. Wait for the test to finish
3. Go to RabbitMQ console and it shows queues:

4. Restart RabbitMQ
5. Do steps 1, 2, 3 and the console should show 0 queues:

Reviewers: michal, bartek, varun, jon

Reviewed By: michal, bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D9317