Miscellaneous .NET 7 work

[marcpopMSFT]

This epic covers work not included in other .net 7 epics. This is carryover of work from #12900

• 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
• Avoid downloading MSBuild SDKs from NuGet on the VS UI thread](Avoid downloading MSBuild SDKs from NuGet on the VS UI thread project-system#6069)
• Figure out relationship between Directory.Build.targets and workloads Figure out relationship between Directory.Build.targets and workloads #15505

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• Solve the problem of needing to have a default target import prior to the workload targets (as directory.build.targets is after): Workload Target Imports Design designs#224
• Remaining cswinrt work Remaining work for windows targeting #12387

[marcpopMSFT]

Did all we were going to do for .net 7 so closing out.