Ensure GET v2/validator/aggregate_attestation is backwards compatible

[eserilev]

Issue Addressed

Closes #6983

Proposed Changes

GET v2/validator/aggregate_attestation is not backwards compatible. It only works for post electra attestations. This PR adds backwards compatibility and additional test coverage. We should include this in the upcoming 7.0 beta release if possible

[pawanjay176]

This looks good to me.
I tested it by using v2 for both deneb and electra by modifying the lighthouse VC here

lighthouse/validator_client/validator_services/src/attestation_service.rs

Lines 564 to 575 in 431dd7c

	beacon_node
	.get_validator_aggregate_attestation_v2(
	attestation_data.slot,
	attestation_data.tree_hash_root(),
	committee_index,
	)
	.await
	.map_err(|e| {
	format!("Failed to produce an aggregate attestation: {:?}", e)
	})?
	.ok_or_else(|| format!("No aggregate available for {:?}", attestation_data))
	.map(|result| result.data)

It works as expected. Wondering if we v2 all across.

[michaelsproul]

It works as expected. Wondering if we v2 all across.

I think at this late stage I'm fine with sticking to v1 prior to Electra. We could consider changing this for v7.0.0 proper though

[michaelsproul]

@mergify queue

[mergify]

queue

✅ The pull request has been merged automatically

The pull request has been merged automatically at ed8086c