[dashboard] Removes ray.rpc.ReportEventService and Dashboard head as gRPC server. #45219
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The Dashboard Head is an HTTP server as well as a gRPC server. The latter only serves 1 single gRPC service: ray.rpc.ReportEventService and its only method's only usage is from the Dashboard Agent in event_agent.py. This PR replaces the RPC with HTTP and removes the Head's ability to serve as a gRPC server. Note, it still has gRPC clients sending RPCs to Agents, Raylets and GCS.
This is a step forward to remove all gRPC usage from the head.