Fix some broken expectations in RN integration tests (#47615)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/47615

Changelog: [internal]

Fixes `.not` not being applied in some cases, and no logging the "not" label in case of error, and `.toBe` being flipped.

Reviewed By: javache

Differential Revision: D65952221

fbshipit-source-id: 030c0597b661d34e6324d69e5676375150a74f2e