Align GLOAS fork choice with spec

- Move proposer boost from apply_score_changes to get_weight, matching
  the spec's structure where get_weight adds boost via is_supporting_vote
- Implement is_supporting_vote and get_ancestor_node spec functions
- Fix should_extend_payload: return true when proposer_boost_root is zero
- Compute record_block_timeliness from time_into_slot instead of hardcoding false
- Fix anchor block_timeliness to [true, true] per get_forkchoice_store spec
- Add equivocating_attestation_score for is_head_weak monotonicity
- Use payload-aware weight in is_parent_strong
- Add with_status helper on IndexedForkChoiceNode
- Simplify find_head_walk to return IndexedForkChoiceNode directly

consensus/proto_array/src/fork_choice_test_definition.rs

@@ -10,6 +10,7 @@ use fixed_bytes::FixedBytesExtended;
 use serde::{Deserialize, Serialize};
 use ssz::BitVector;
 use std::collections::BTreeSet;
+use std::time::Duration;
 use types::{
     AttestationShufflingId, ChainSpec, Checkpoint, Epoch, EthSpec, ExecutionBlockHash, Hash256,
     MainnetEthSpec, Slot,
@@ -288,6 +289,7 @@ impl ForkChoiceTestDefinition {
                             self.justified_checkpoint,
                             self.finalized_checkpoint,
                             &spec,
+                            Duration::ZERO,
                         )
                         .unwrap_or_else(|e| {
                             panic!(