Summary:
Analyze code was still using the CIRCLECI env variable to retrieve the PR number.
This change uses the github one and also removes a duplicated flow check
## Changelog:
[Internal] - Remove duplicated flow check and use gh PR number rather than CircleCI one
Pull Request resolved: https://github.com/facebook/react-native/pull/46548
Test Plan: Tested locally and in CI
Reviewed By: NickGerleman
Differential Revision: D62883758
Pulled By: cipolleschi
fbshipit-source-id: 0c7e97ea9caf4465972424e0b69a899ecfd07095
6d61899fc5