Update eslint to v9 (#35485)

Update eslint and all plugins. Many plugins still do not ship type
definitions so I had to add stubs. Also, I had to put a few typescript
error expectations because if some unknown error in the types.

`eslint-plugin-no-jquery` is disabled because it's not compatible with
eslint 9 flat config
(https://github.com/wikimedia/eslint-plugin-no-jquery/issues/311).

web_src/js/features/codeeditor.ts

@@ -19,7 +19,7 @@ type EditorConfig = {
   trim_trailing_whitespace?: boolean,
   insert_final_newline?: boolean,
   root?: boolean,
-}
+};
 
 const languagesByFilename: Record<string, string> = {};
 const languagesByExt: Record<string, string> = {};