[Merged by Bors] - Fix attestation performance API `InvalidValidatorIndex` error#3503

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macladson wants to merge 2 commits intosigp:unstablefrom macladson:attestation-perf-fix

+28-4

Commits on Aug 24, 2022

Fix attestation performance api
macladson
committed

Commits on Aug 25, 2022

Handle error in epoch processing summary functions
macladson
committed