SwiftBuild: Enable traits support (#8873)

When Creasting the SwiftBuildSystem Factory, the traits configuration
was not passed when loading the package graph.

Update the factory to pass the traits configuration during package
resolution, and remove the `withKnownIssues` in TraitTests as it relates
to SwiftBuild.

There are some know issues, which are tracked via the automated tests.

Author: bkhouri

Sources/CoreCommands/BuildSystemSupport.swift

@@ -120,7 +120,8 @@ private struct SwiftBuildSystemFactory: BuildSystemFactory {
             buildParameters: productsBuildParameters ?? self.swiftCommandState.productsBuildParameters,
             packageGraphLoader: packageGraphLoader ?? {
                 try await self.swiftCommandState.loadPackageGraph(
-                    explicitProduct: explicitProduct
+                    explicitProduct: explicitProduct,
+                    traitConfiguration: traitConfiguration,
                 )
             },
             packageManagerResourcesDirectory: swiftCommandState.packageManagerResourcesDirectory,