Summary:
Factor out build-apple-slices-hermes to a seprate action to reuse code

## Changelog:
[Internal] - Refactor the CI to reuse code

Pull Request resolved: https://github.com/facebook/react-native/pull/45359

Test Plan: GHA are green

Reviewed By: cortinico

Differential Revision: D59575467

Pulled By: cipolleschi

fbshipit-source-id: 5d253f3dd523cb70b768c62db10fb7ff39fbd49f