fix: downgrade eslint to v8 for react-scripts 5.0.1 compatibility

react-scripts 5.0.1 uses eslint-webpack-plugin@3.2.0 which passes
extensions and resolvePluginsRelativeTo options removed in eslint 9.
Using eslint 8.57.x which still supports these options.

Tested locally - build succeeds.

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

Author: Ayaz-Microsoft

src/ContentProcessorWeb/package.json

@@ -57,7 +57,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.39.2",
-    "eslint": "^9.0.0",
+    "eslint": "^8.57.0",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
     "@testing-library/user-event": "^14.6.1",