Adding a CI leg for design time builds

[Anipik]

The design time builds are necessary part of vs experience.
They are easy to break and the breaks in design time build are difficult to catch.
It will be nice to have some kind of CI leg protection here which ensures we dont regress any design time behavior.

cc @ericstj @danmosemsft @ViktorHofer @safern

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[ViktorHofer]

@davkean can you please point us to a resource that explains how to do that in CI?

[Anipik]

We will need more protections against the the VS experience. Some of these can be easily done

• Protection again not breaking the BuildInsideVisualStudio failures // This can be easily done by setting /p:BuildInsideVisualStudio=true
• Adding project references to the sln files // we can ensure by writing a post compile msbuild task.
• No tfms derive property in the first property group
• first tfm needs to be net5.0. This is also required for the solution explorer to work properly in visual studio.
• design Time build check in ci

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