Run GHA on main (#44723)

Summary:
In the previous months, we worked with a GH engineer to run our test workflow on PRs. The workflow was running properly, so we want to run it on main too.

## Changelog:
[Internal] - Run gha on main too

Pull Request resolved: https://github.com/facebook/react-native/pull/44723

Test Plan: GHA is green

Reviewed By: cortinico, NickGerleman

Differential Revision: D57975230

Pulled By: cipolleschi

fbshipit-source-id: 89d06361ad6f2230b7000e05970e9b16539c9164