Undo workaround for inboxed analyzers after updating to Preview 7

[ryalanms]

Undo workaround for inboxed analyzers after updating to Preview 7.

WPF, WinForms, and WindowsDesktop required this Arcade change. After updating to Preview 7, remove Exclude inboxed analyzers from VerifyClosure task dotnet/arcade#7624.

[ericstj]

Moving to WPF as workaround will be moved here.

[ryalanms]

Reverted here: dotnet/arcade@7b88b24.

Thanks, @ericstj.

[ericstj]

I moved this here to track undoing #4849

[ericstj]

I believe you should be able to undo that now, since you're on an RC sdk.

[ericstj]

Let me see if I can do this now.