message: Expand environment variables in ConptyConnection
  Fixes
diff: @@ -61,7 +61,7 @@ namespace winrt::Microsoft::Terminal::TerminalConnection::implementation
  NULL,
  NULL));
  - std::wstring cmdline{ _commandline.c_str() }; // mutable copy -- required for CreateProcessW
  + std::wstring cmdline{ wil::ExpandEnvironmentStringsW<std::wstring>(_commandline.c_str()) }; // mutable copy -- required for CreateProcessW
  Utils::EnvironmentVariableMapW environment;
  