Automate checking for artifacts on Maven (#50275)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/50275

This change adds a check to automate a step in the release process: https://github.com/reactwg/react-native-releases/blob/main/docs/guide-release-process.md#verify-assets-have-been-uploaded-to-maven

The script will poll maven for 90 minutes and return when the artifacts are available. If, after 90 minutes, artifacts are not available, it exits with code 1 that should fail the Release workflow. The Release Crew should have a look at what's happened.

## Changelog:
[Internal] - Automate the check for artifacts being on Maven

Reviewed By: fabriziocucci

Differential Revision: D71825014

fbshipit-source-id: 8879bf9c8fc4519e86b55ad8f9bd3ecf3f8ecfb7