chore: Remove resize observer polyfill leftovers (#3875)

Author: just-boris

__mocks__/@juggle/resize-observer.ts

@@ -7,14 +7,4 @@ if (typeof window !== 'undefined') {
   require('@testing-library/jest-dom/extend-expect');
   const { cleanup } = require('@testing-library/react');
   afterEach(cleanup);
-
-  // Mock ResizeObserver for JSDOM environment
-  global.ResizeObserver = class ResizeObserver {
-    constructor(callback) {
-      this.callback = callback;
-    }
-    observe() {}
-    unobserve() {}
-    disconnect() {}
-  };
 }

build-tools/jest/setup.js

@@ -166,7 +166,7 @@
     {
       "path": "lib/components/internal/widget-exports.js",
       "brotli": false,
-      "limit": "891 kB",
+      "limit": "885 kB",
       "ignore": "react-dom"
     }
   ],