Reftests alpha8

[zilm13]

PR Description

Some network tests are still ignored, we will address it later without hurry

Fixed Issue(s)

Documentation

• I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• I thought about adding a changelog entry, and added one if I deemed necessary.

---

Note

Low Risk
Changes are confined to reference tests, spec metadata, and read-only fork-choice test hooks; production fork-choice logic is only exposed for spec-test assertions, not altered in behavior beyond that wiring.

Overview
Bumps consensus-spec-tests from v1.7.0-alpha.7 to alpha.8, re-enables Gloas pyspec discovery (removes the alpha.7 skip), and refreshes specrefs (version, Gloas/Electra deltas, temporary exceptions for not-yet-aligned areas).

Reference-test harness: adds createAnchorFromStateAndMatchingBlock and uses it in gossip block/attestation/aggregate setup so the store anchor matches fixture blocks when state_root aligns; gossip block setup gains execution payload status handling and stricter setup import assertions; attestation gossip loads Electra SingleAttestation when applicable.

Fork-choice tests: full on_execution_payload_envelope coverage; new on_payload_attestation_message steps (wire vs block, valid flag); fork-choice checks for payload_timeliness_vote and payload_data_availability_vote, backed by new read APIs on ForkChoiceStrategy / ForkChoiceModelGloas (PTC vote tracker).

Gossip test registration: gossip_beacon_block enabled; gossip_bls_to_execution_change enabled with one skipped case; attestation/aggregate/blob gossip remain ignored.

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[zilm13]

Current failures, 3:

gloas - mainnet - fork/fork > fork_invalid_validator_deposit_followed_by_builder_credentials FAILED
    java.lang.AssertionError: Expected BeaconStateGloasImpl's to be equal by getter, but found differences:

gloas - minimal - fork/fork > fork_invalid_validator_deposit_followed_by_builder_credentials FAILED
    java.lang.AssertionError: Expected BeaconStateGloasImpl's to be equal by getter, but found differences:

gloas - mainnet - operations/voluntary_exit > builder_voluntary_exit__success FAILED
    org.opentest4j.AssertionFailedError: 

fork/fork are probably fixed with #10729
not sure about operations one, could recheck later when all alpha.8 parts are in master and this pr is rebased on top of it

[StefanBratanov]

Current failures, 3:

gloas - mainnet - fork/fork > fork_invalid_validator_deposit_followed_by_builder_credentials FAILED
    java.lang.AssertionError: Expected BeaconStateGloasImpl's to be equal by getter, but found differences:

gloas - minimal - fork/fork > fork_invalid_validator_deposit_followed_by_builder_credentials FAILED
    java.lang.AssertionError: Expected BeaconStateGloasImpl's to be equal by getter, but found differences:

gloas - mainnet - operations/voluntary_exit > builder_voluntary_exit__success FAILED
    org.opentest4j.AssertionFailedError: 

fork/fork are probably fixed with #10729 not sure about operations one, could recheck later when all alpha.8 parts are in master and this pr is rebased on top of it

Voluntary tests fail because of MIN_WITHDRAWABILITY_DELAY very likely. Can you just ignore those tests for now and they will be fixed in #10729

[zilm13]

@StefanBratanov everything is fixed, not actual

[StefanBratanov]

LGTM apart from one comment

[StefanBratanov]

We moved this to:

tech.pegasys.teku.spec.logic.common.weaksubjectivity.WeakSubjectivityCalculator by the way