* Update to beta3 spec tests
* `ProcessEpochParticipation` processes only active indices
* Go fmt
* Update epoch_precompute_test.go
* Update WORKSPACE
* Fix current and previous epoch switch up
* Add epoch precompute methods
* Split into part 1 for better review
* Update epoch_precompute_test.go
* Preston's feedback
* Skip if the valiator is not eligible
* Add regression test for non eligible
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>