refactor: Remove unused reportWebVitals.ts and update jest config

- Delete react/src/reportWebVitals.ts (not imported anywhere)
- Remove reportWebVitals.ts from jest coverage exclusion list

Co-authored-by: yomybaby <621215+yomybaby@users.noreply.github.com>

Author: Copilot

react/jest.config.js

@@ -27,6 +27,5 @@ module.exports = {
     'src/**/*.{js,jsx,ts,tsx}',
     '!src/**/*.d.ts',
     '!src/index.tsx',
-    '!src/reportWebVitals.ts',
   ],
 };