Re-issue ForkchoiceUpdate based on updated PayloadStatus (#9102)

Co-Authored-By: hopinheimer <knmanas6@gmail.com>

Co-Authored-By: Michael Sproul <michael@sigmaprime.io>

Co-Authored-By: Michael Sproul <michaelsproul@users.noreply.github.com>

beacon_node/beacon_chain/src/test_utils.rs

@@ -771,6 +771,36 @@ where
             .execution_block_generator()
     }
 
+    /// Create a switch-to-compounding `ConsolidationRequest` for the given validator.
+    ///
+    /// Panics if the validator doesn't exist, doesn't have eth1 withdrawal credentials,
+    /// or doesn't have an execution withdrawal address.
+    pub fn make_switch_to_compounding_request(
+        &self,
+        validator_index: usize,
+    ) -> ConsolidationRequest {
+        let head = self.chain.canonical_head.cached_head();
+        let head_state = &head.snapshot.beacon_state;
+        let validator = head_state
+            .get_validator(validator_index)
+            .expect("validator should exist");
+
+        assert!(
+            validator.has_eth1_withdrawal_credential(&self.spec),
+            "validator {validator_index} should have eth1 withdrawal credentials"
+        );
+
+        let source_address = validator
+            .get_execution_withdrawal_address(&self.spec)
+            .expect("validator should have execution withdrawal address");
+
+        ConsolidationRequest {
+            source_address,
+            source_pubkey: validator.pubkey,
+            target_pubkey: validator.pubkey,
+        }
+    }
+
     pub fn set_mock_builder(
         &mut self,
         beacon_url: SensitiveUrl,