Receiving server timeout from grpcio >= 1.50.0 results in exceptional shutdown

[stephenc-pace]

The test test_timeout_while_streaming_result fails intermittently against versions of grpcio >= 1.50.0 and I would expect others to as well.

From debugging, we appear to receive multiple frames from the server with deadline exceeded headers which results in h2 throwing a StreamClosed exception after the first frame.

I've pinned (will pin) the version of grpcio we're testing against to prevent flakey tests for now but this would cause issues running against servers using these versions of grpcio.

As a side note, I'm not sure the test TestDeadlineExceededAtClient.test_timeout_while_streaming_result is good as the server also times out.