SwiftBuild: Enable traits support

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.

Also augment te tests to run against all build configuration.

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,