Add patch script to enable E2E tests in CI (#46546)

Summary:
This chang introduces a patch file that can be applied to run the E2E tests in CI.

From the root folder `react-native`, a user can just run:

```sh
git apply packages/rn-tester/scripts/enable-e2e-tests.patch
```

And then add a commit to their PR to see whether the newly added E2E tests are actually running

## Changelog:
[Internal] - add patch to simplify running E2E tests in CI

Pull Request resolved: https://github.com/facebook/react-native/pull/46546

Test Plan: Tested locally

Reviewed By: NickGerleman

Differential Revision: D62880559

Pulled By: cipolleschi

fbshipit-source-id: 19d639b2641aaa50e4f3e0753018d426d2da81c9