Fix final remaining Py_ patterns

- Fixed Py_CONSTANT_* → Ty_CONSTANT_*
- Fixed Py_UNREACHABLE → Ty_UNREACHABLE
- Fixed Py_*_input constants (file_input, single_input, eval_input, func_type_input)
- Fixed _Py_COMP_DIAG_* compiler diagnostic macros

Build continues to progress toward completion.

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

Python/ast.c

@@ -127,7 +127,7 @@ expr_context_name(expr_context_ty ctx)
         return "Del";
     // No default case so compiler emits warning for unhandled cases
     }
-    Py_UNREACHABLE();
+    Ty_UNREACHABLE();
 }
 
 static int

Python/context.c

@@ -107,7 +107,7 @@ context_event_name(PyContextEvent event) {
         default:
             return "?";
     }
-    Py_UNREACHABLE();
+    Ty_UNREACHABLE();
 }
 
 static void