Test reanimated using nightlies (#50428)

Summary:
Use nightlies to test reanimated with RN nightlies

## Changelog:
[Internal] - use reanimated nightlies together with react native nightlies to spot breaking changes

Pull Request resolved: https://github.com/facebook/react-native/pull/50428

Test Plan: GHA - Tested triggering it from a PR in this job: https://github.com/facebook/react-native/actions/runs/14197051228?pr=50428

Reviewed By: cortinico

Differential Revision: D72243345

Pulled By: cipolleschi

fbshipit-source-id: 297ec0073dfc32ec5a5e90630b93867fac0b564f