Fix DotnetSharedFrameworkTaskDir to not rely on DotnetBuildFromSource #8355
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After #8338 we saw a build error in a dotnet/runtime build job that tries to validate source-build but still uses the non-source-built arcade packages:
This is because the non-source-built arcade packages use netcoreapp3.1 libraries instead of net6.0, but we're still setting DotnetBuildFromSource=true in those builds.
Instead of using DotnetBuildFromSource to switch between libraries we can check for the existence of the net6.0 folder which works in both scenarios.