[tunnelbroker] Recover AMQP consumers

Summary:
When a consumer returns a confirmation error, we can try restoring it without closing the WebSocket session

Depends on D13605

Test Plan: Test plan from D13595 (commtest) sometimes failed on this confirmation. Now it's no longer happening

Reviewers: kamil, varun, will

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13606