Run Android Build and Tests Against 8-core-ubuntu (#44248)

Summary:
The final merged GitHub Actions PR ended up keeping us on `ubuntu-latest` for Android jobs. These are ridiculously slow and are also now running out of disk space (which then files a task on a random change author). E.g. https://github.com/facebook/react-native/actions/runs/8826104037/job/24231379139

Switch to the `8-core-ubuntu`, which is closer to what we were using for CircleCI, and has more disk space: https://docs.github.com/en/actions/using-github-hosted-runners/about-larger-runners/about-larger-runners#specifications-for-general-larger-runners

Changelog:
[Internal]

Pull Request resolved: https://github.com/facebook/react-native/pull/44248

Test Plan: GitHub Actions still runs these successfully

Reviewed By: cortinico

Differential Revision: D56558697

Pulled By: NickGerleman

fbshipit-source-id: 180abcf2d3420760c090c0c21173afc6fa5bcf0c