Add Android Helloworld test on PR (#45019)

Summary:
Use GHA on PRs:
1. run test_android_helloworld when users create a PR, to provide coverage while we figure out what's going on with our CircleCI tests / deprecate them.

2. fixes uploading the `.apks` that are generated.

Changelog: [Internal]

Pull Request resolved: https://github.com/facebook/react-native/pull/45019

Test Plan: Does GHA run for this PR?

Reviewed By: cipolleschi

Differential Revision: D58728019

Pulled By: blakef

fbshipit-source-id: c6db41d60225702d50343384f103585d83e3528c