Check for unused pyright: ignore and differentiate from mypy ignores (#9397)

pyrightconfig.json

@@ -35,6 +35,12 @@
     "reportInconsistentConstructor": "error",
     "reportTypeCommentUsage": "error",
     "reportUnnecessaryComparison": "error",
+    "reportUnnecessaryTypeIgnoreComment": "error",
+    // Leave "type: ignore" comments to mypy
+    "enableTypeIgnoreComments": false,
+    // Stubs are allowed to use private variables
+    "reportPrivateUsage": "none",
+    // Stubs don't need the actual modules to be installed
     "reportMissingModuleSource": "none",
     // Incompatible overrides and property type mismatches are out of typeshed's control
     // as they are inherited from the implementation.