fix: add eslint as explicit devDependency and revert @eslint/js to ^9.x

- Add eslint@^9.0.0 as devDependency to fix 'Cannot find module eslint' build error
- Revert @eslint/js from ^10.0.1 to ^9.39.2 for compatibility with react-scripts 5.x
- Regenerate pnpm-lock.yaml

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Ayaz-Microsoft

src/ContentProcessorWeb/package.json

@@ -56,7 +56,8 @@
     ]
   },
   "devDependencies": {
-    "@eslint/js": "^10.0.1",
+    "@eslint/js": "^9.39.2",
+    "eslint": "^9.0.0",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
     "@testing-library/user-event": "^14.6.1",