Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/36384
## Changelog:
[Internal] - Adds more test coverage to PerformanceEntryObserver functionality related to buffering of the marks/measures, as well as making fixes for certain corner cases handled incorrectly (which are now covered by tests).
Reviewed By: rubennorte
Differential Revision: D43835928
fbshipit-source-id: fc8adbd6c2a2b6b201f1f14bdf51245268c5eabd