Epic: Miscellaneous .NET 5 work

[dsplaisted]

This epic tracks work targeting .NET 5 which is not covered by any of the other epics.

• Provide WinRT APIs for projects targeting Windows Provide WinRT APIs for projects targeting Windows #11556
• When global.json specifies an SDK that can't be found, don't block project load in Visual Studio: When global.json specifies an SDK that can't be found, don't block project load in Visual Studio #11238
• Build warning when targeting out of support SDK Trigger a build warning when targeting an out of support SDK #12060
• Add output to dotnet run Provide more immediate feedback when an ASP.NET Core app is running #12227 (Web SDK)

---

• Get latest runtime patch information without requiring users to update the SDK: Get latest runtime patch information without requiring users to update the SDK #11226
• Include PDBs and XML files from packages in project output: New project system doesn't copy PDBs from packages #1458
• Support setting a common root output path via a single property: Support common output directory root in SDK out of the box #867

.NET 6

• Avoid downloading MSBuild SDKs from NuGet on the VS UI thread
• Self-contained apps can use the Mono VM (and AOT) on desktop operating systems: Self-contained apps can use the Mono VM (and AOT) on desktop operating systems #11227
• Remaining cswinrt work Remaining work for windows targeting #12387