fix(proof-validation): handle optional proof status

Ensure proof status is treated as optional, preventing crashes when status is absent.
- Modify status field to `Option<String>` in `Proof` struct.
- Update validation logic to handle `None` values safely.
- Adjust main logic to check for "permanently_ignored" safely.

bin/verify-era-proof-attestation/src/main.rs

@@ -155,7 +155,10 @@ async fn verify_batch_proofs(
         total_proofs_count += 1;
         let tee_type = proof.tee_type.to_uppercase();
 
-        if proof.status.eq_ignore_ascii_case("permanently_ignored") {
+        if proof
+            .status
+            .map_or(false, |s| s.eq_ignore_ascii_case("permanently_ignored"))
+        {
             trace!(
                 batch_no,
                 tee_type,