Add ExponentTest.log method that we can filter with os_log + bail out early
Add ExponentTest.log method that we can filter with os_log + bail out early

- ExponentTest.log is a method that uses os_log, which we can see in the simulator's log stream.
- We bail out of the tests early in CI on iOS since they freeze. Need to look into this more later.

fbshipit-source-id: bf8d6b0

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