Improve processAttestation

[twoeths]

Describe the bug

One of the most heavy operation from this profile is processAttestation - signature verification, it takes more than 23% of the time

1. In some cases when we pass errorred attestations to chain, we make verifySignature as true by default just in the end put these errorred attestations in eventHandlers.onErrorAttestation
2. In eventHandler when we reprocess attestations from pending blocks or new slots we process attestations separately

Expected behavior

1. We should make verifySignature as false in scenario 1 above. When we reprocess these errored attestations, we'll verify signatures again anyway
2. In scenario 2, we want to do signature verification in batch.

0624-prater-full-attestation-subscriptions.cpuprofile.zip

Steps to Reproduce

Sync prater with full attestation subscriptions

[twoeths]

not an issue anymore with latest gossip attestation update #2760