Add solution global properties for solution-based graphs

[dfederm]

Add solution global properties for solution-based graphs

More in the vein of #8625 and #8855. Getting sln-based graph builds to be more aligned with non-graph sln builds.

[rainersigwald]

Any way to validate that this is the full set of magic solution properties? I can't think of a great one myself.

[dfederm]

Any way to validate that this is the full set of magic solution properties? I can't think of a great one myself.

I compared binlogs, but I don't think you're talking about manual validation.

The only thing I can think of is to create a helper in SolutionProjectGenerator, but even then it uses a ProjectPropertyGroupElement while the graph code uses a ImmutableDictionary<string, string>.Builder. So extra allocation there to copy the collection or taking some Action<string, string> which also would allocate.