Revert executable target code on Windows

Author: plemarquand

assets/test/targets/Sources/ExecutableTarget/main.swift

@@ -1,3 +1,6 @@
+#if os(Windows) && swift(<6.0)
+print("Executable Target Hello World!")
+#else
 import Foundation
 
 @main
@@ -36,4 +39,5 @@ struct JSONFormat: Decodable {
 enum CodeGeneratorError: Error {
     case invalidArguments
     case invalidData
-}
+}
+#endif