* Update op_pool to use proper rewards
* Fix missing use import for tests
* Address Michael's comments
* Revert to private ValidatorStatuses
* Rename variable for clearer code
* Fix update_cover function
* Remove expect
* Add WIP test for rewards
* Use aggregation_bits instead of earliest_attestation_validators
* Use earliest attestation in test and correct typo
* Fix op_pool test thanks to @michaelsproul 's help
* Change test name