Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49122
This change updates the Release testing and the release scripts by removing any reference to CircleCI
## Changelog:
[Internal] - Remove CircleCI references from Release and Release testing scripts
Reviewed By: cortinico, huntie
Differential Revision: D69047479
fbshipit-source-id: 14a394b879c03cd81a8d043036c43839a38602c7