* Process atts and updeate head
* Fix ctx
* New test and old tests
* Update validator_test.go
* Update validator_test.go
* Update service.go
* Rename to UpdateHead
* Update receive_attestation.go
* Update receive_attestation.go
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>