Report better warnings and errors if build hosts exit abnormally #71909
+141
−25
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This reports warnings or errors through the ILogger passed to the BuildHostProcessManager if a process exits abnormally, and includes the stderr of the process. Without this you'd be able to manually turn on tracing in VS Code, but that required extra steps to diagnose. This also allows us to pass warnings and errors through to MSBuildWorkspace, which otherwise didn't pass along this information.
Commit-at-a-time might be helpful, since an unrelated test got cleaned up during this change since it was written differently than the rest of all the tests.