Integration test failure: CSharpChangeSignatureDialog.VerifyReorderParameters/VerifyRemoveParameter "Failed to write to an IPC Port: The pipe is being closed."

PR: https://github.com/dotnet/roslyn/pull/28983
Failure: https://ci.dot.net/job/dotnet_roslyn/job/master/job/windows_debug_vs-integration_prtest/3128/

Failures: 
- `Failed to write to an IPC Port: The pipe is being closed.`
- `The channel 'IPC channel client for 3816' is already registered.`