Automate the draft release creation (#50346)

Summary:
This PR automates the creation of Draft releases on Github that we have to do manually every time we create a new release.

## Changelog:
[Internal] - Automate the creation of draft releases on Github

Pull Request resolved: https://github.com/facebook/react-native/pull/50346

Test Plan:
GHA - tested as a separate workflow: https://github.com/facebook/react-native/actions/runs/14132774202/job/39597050776?pr=50346

The drafted release is at: https://github.com/facebook/react-native/releases/tag/untagged-e78c788fe9c861ad28ff

Reviewed By: cortinico

Differential Revision: D72061067

Pulled By: cipolleschi

fbshipit-source-id: ddcdae701e272a59c18f58ba431d1eb3b8cd5b36