Factor Razor MEF to be fully coherent under cohosting

[phil-allen-msft]

When running under cohosting, assemblies previously loaded in the Razor LSP will now load in the Roslyn LSP, and the containers for MEF are expected to interact differently. The key here is to factor MEF such that whether the Razor LSP is active OR we under cohosting, all of the MEF services are able to load successfully.

• Stop exporting Roslyn workspace and language services #9515
• Invert IProjectSnapshotChangeTrigger composition #9950
• Remove Microsoft.VisualStudio.LiveShare.Razor project #9894
• Microsoft.CodeAnalysis.Remote.Razor should only be loaded in Roslyn OOP #9898
• Remove dependency from on LanguageClient on LanguageServer #10096
• Stop including Microsoft.AspNetCore.Razor.LanguageServer as a MEF component #10099
• Merge Microsoft.VisualStudio.LanguageServerClient.Razor into Microsoft.VisualStudio.LanguageServices.Razor #10126
• Remove remaining MEF exports from Microsoft.CodeAnalysis.Razor.Workspaces #10127

[DustinCampbell]

With the last todo issue closed, I'm going to go ahead and close this.