Cleanup and spec parity fixes

- Add missing payload attestation slot check: spec returns early when
  data.slot != block.slot (PTC votes only for assigned block)
- Remove dead ignored tests (need mock EL Gloas support to run)
- Remove unused new_with_gloas and inspect_queued_payload_attestations
- Remove gloas entries from bin.rs (not part of this PR)
- Collapse nested if in payload attestation error handling (clippy)
- Rename env -> envelope in load_parent
- Add TODO(gloas) for parent_head_hash in re-org path
- Remove head_payload_status from ForkchoiceUpdateParameters (lives on
  CachedHead, sourced from get_head return)

consensus/proto_array/src/bin.rs

@@ -18,14 +18,6 @@ fn main() {
         "execution_status_03.yaml",
         get_execution_status_test_definition_03(),
     );
-    write_test_def_to_yaml(
-        "gloas_chain_following.yaml",
-        get_gloas_chain_following_test_definition(),
-    );
-    write_test_def_to_yaml(
-        "gloas_payload_probe.yaml",
-        get_gloas_payload_probe_test_definition(),
-    );
 }
 
 fn write_test_def_to_yaml(filename: &str, def: ForkChoiceTestDefinition) {