Fixes dotnet#10696 Fixes dotnet#10769 Fixes dotnet#10874 Needs Roslyn change: dotnet/roslyn#75102 The actual code change was quite straight foward. The test code was a bigger pain. Previously in cohosting tests we had two MEF composition, one for Razor and one for Roslyn. Since Roslyn diagnostics can only run, or at least start, in devenv, we now need three MEF compositions - Roslyn devenv, Roslyn OOP and razor OOP - and two workspaces - Roslyn devenv and Roslyn OOP - and our previous MEF infrastructure really didn't handle this well, as evidenced by the fact that this PR also fixes dotnet#10874 Now our MEF infra is simpler: We still cache catalogs etc. statically the save time, but we create an `ExportProvider` as needed and expect consumers to dispose of it like any other `IDisposable`, though there is also here a test fixture to share the editor composition in the formatting tests so we don't pay a huge penalty in terms of test run time. Commit-at-a-time if you want to read the story from beginning to end, but it should be reasonably okay to just review as a whole too.

Port Diagnostics endpoint to cohosting #10696

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