Remove node-fetch and fetch-mock

We do not appear to actually use either of these packages (we've only been using `fetch` in Node since v18, which has it built-in), so this drops them. Resolves some security vulnerabilities while we're at it.

Author: Mr0grog

package-lock.json

@@ -29,13 +29,11 @@
     "eslint": "^8.57.1",
     "eslint-plugin-react": "^7.37.5",
     "extract-loader": "^5.1.0",
-    "fetch-mock": "^9.11.0",
     "husky": "^9.1.7",
     "jest": "^30.0.0",
     "jest-environment-jsdom": "^30.0.0",
     "moment": "^2.30.1",
     "moment-locales-webpack-plugin": "^1.2.0",
-    "node-fetch": "^3.3.2",
     "postcss": "^8.5.6",
     "postcss-loader": "^8.1.1",
     "react": "^16.14.0",