Add tests for importing blocks on invalid parents (#3123)

## Issue Addressed

NA

## Proposed Changes

- Adds more checks to prevent importing blocks atop parent with invalid execution payloads.
- Adds a test for these conditions.

## Additional Info

NA

consensus/proto_array/src/error.rs

@@ -44,6 +44,10 @@ pub enum Error {
     IrrelevantDescendant {
         block_root: Hash256,
     },
+    ParentExecutionStatusIsInvalid {
+        block_root: Hash256,
+        parent_root: Hash256,
+    },
 }
 
 #[derive(Clone, PartialEq, Debug)]