Fix flaky test
=== RUN TestContextIgnoredIfStartedStreaming
connection_test.go:436:
Error Trace: /src/internal/module/reverse_tunnel/agent/connection_test.go:436
/src/internal/module/reverse_tunnel/agent/value.go:556
/src/internal/module/reverse_tunnel/agent/value.go:339
/src/internal/module/reverse_tunnel/agent/call.go:132
/src/internal/module/reverse_tunnel/agent/controller.go:251
/src/internal/module/reverse_tunnel/agent/rpc.go:235
/src/internal/module/reverse_tunnel/agent/stream_visitor.go:79
/src/internal/module/reverse_tunnel/agent/connection.go:93
/src/internal/module/reverse_tunnel/agent/connection_test.go:443
Error: Unexpected context cancellation
Test: TestContextIgnoredIfStartedStreaming
--- FAIL: TestContextIgnoredIfStartedStreaming (0.00s)