Revert "Filter attestation with ProcessAttestationNoSignatureVerify" #4529
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Reverts #4513
Discussed offline that this could generate blocks that immediately fail. Given that we only mark attestations as "deleted" from the pool on a successful block inclusion, we could end up with a stalled chain until that attestation is no longer valid. We're also not observing much improvement in GetBlock latency times with this change and we believe the bottleneck is in redundant computation of ProposerIndex.