* agent: release JobTerminate handler when job ends before registration
JobRequest registered the job's JobTerminate handler after AssignJob
returned, so an ended UpdateJobStatus or worker disconnect handled in
between deregistered nothing and the handler leaked. AssignJob also sent
the assignment before recording the job as running, so an immediate
ended update was dropped.
Record the job before sending the assignment, and after registering the
handler recheck under h.mu that the job is still running and its worker
still registered, deregistering otherwise.
Fixes#4901
* replace utils.CloneProto with proto.CloneOf
* agent: wait on worker readiness and poll for released handlers in test
- Store agent dispaches independently of room agents on rtc.Room
- Serialize agent dispatches in rtc.Room
- Support for agent dispatch and job serialization in redis
The agent Job object references denormalized Room and ParticipantInfo object. When storing Jobs, this sets the Room to nil, and only stores the Participant identity field. When read back, these fields need to be set to their current value.