[cxx-interop] Do not run SIL/verify_all_overlays.py on std

rdar://93420692

Author: egorzhdan

validation-test/SIL/verify_all_overlays.py

@@ -23,6 +23,10 @@
     # Skip the standard library because it's tested elsewhere.
     if module_name == "Swift":
         continue
+    # Skip the C++ standard library overlay because it's not yet shipped
+    # in any released SDK.
+    if module_name == "std":
+        continue
     # TODO(TF-1229): Fix the "_Differentiation" module.
     if module_name == "_Differentiation":
         continue