Fix check nightlies by escaping the artifact folder (#50726)

Summary:
The check nightlies job is failing on some libraries because the library key contains `/` and ` ` characters that fails to be used properly when they are part of a path.
With this change, we are replacing those characters with `_` so this is a valid path were CI can save the outcome that needs to be collected later.

## Changelog:
[Internal] - Fix folder path

Pull Request resolved: https://github.com/facebook/react-native/pull/50726

Test Plan: Running in GHA

Reviewed By: cortinico

Differential Revision: D73036049

Pulled By: cipolleschi

fbshipit-source-id: 147b9fa15b4dfa08e94f01715e5a175479230d80