Collect nightlies results (#50488)

Summary:
This change adds a job to collect nightlies results so we can then post on discord or internally

## Changelog:
[Internal] - Add a job to collect nightlies results

Pull Request resolved: https://github.com/facebook/react-native/pull/50488

Test Plan: GHA - tested as a job on PRs: https://github.com/facebook/react-native/actions/runs/14283415968/job/40035831913

Reviewed By: cortinico

Differential Revision: D72555358

Pulled By: cipolleschi

fbshipit-source-id: 35ec7e571992f5f27179256570b5d143e0d76586