Uninstall unused Webpack 4 packages (#27058)

<!--
  Thanks for submitting a pull request!
We appreciate you spending the time to work on these changes. Please
provide enough information so that others can review your pull request.
The three fields below are mandatory.

Before submitting a pull request, please make sure the following is
done:

1. Fork [the repository](https://github.com/facebook/react) and create
your branch from `main`.
  2. Run `yarn` in the repository root.
3. If you've fixed a bug or added code that should be tested, add tests!
4. Ensure the test suite passes (`yarn test`). Tip: `yarn test --watch
TestName` is helpful in development.
5. Run `yarn test --prod` to test in the production environment. It
supports the same options as `yarn test`.
6. If you need a debugger, run `yarn test --debug --watch TestName`,
open `chrome://inspect`, and press "Inspect".
7. Format your code with
[prettier](https://github.com/prettier/prettier) (`yarn prettier`).
8. Make sure your code lints (`yarn lint`). Tip: `yarn linc` to only
check changed files.
  9. Run the [Flow](https://flowtype.org/) type checks (`yarn flow`).
  10. If you haven't already, complete the CLA.

Learn more about contributing:
https://reactjs.org/docs/how-to-contribute.html
-->

## Summary

 - Remove unused webpack 4 dependencies

## How did you test this change?

 - Ran `yarn test --prod`
 - Ran `yarn test`

## Related PRs:
 - #26887

Author: anatoliisf

package.json

@@ -97,7 +97,6 @@
     "tmp": "^0.1.0",
     "typescript": "^3.7.5",
     "web-streams-polyfill": "^3.1.1",
-    "webpack": "^4.41.2",
     "yargs": "^15.3.1"
   },
   "devEngines": {