[HOLESKY PECTRA] - committees size warning

[rolfyone]

Committees size couldn't be retrieved for attestation at slot 3711272, block root 0xb7887de8517eed24ef3e0c8cf3146f75de44156c9355817b7d3afd61f25ea884 and target root 0xb7887de8517eed24ef3e0c8cf3146f75de44156c9355817b7d3afd61f25ea884. Will NOT add this attestation to the pool.

a fair number coming in, we'll want to root cause analysis those...

[rolfyone]

this is super similar to another attestations exception we have.
Basically when we're trying to getOrCreateAttestationGroup, we're referencing the attestation->target, and that may be not found.
We really need to be careful and reference the state from processing the block and this wont't be a problem any more.

[rolfyone]

ref. #9178