Introduce scan_stored_accounts_no_data method to AppendVec (anza-xyz#5643)

Add scan_stored_accounts_no_data method to AppendVec

Author: cpubot

accounts-db/src/account_storage/meta.rs

@@ -77,14 +77,6 @@ impl<'storage> StoredAccountMeta<'storage> {
             Self::Hot(_) => unreachable!(),
         }
     }
-
-    pub(crate) fn sanitize(&self) -> bool {
-        match self {
-            Self::AppendVec(av) => av.sanitize(),
-            // Hot account currently doesn't have the concept of sanitization.
-            Self::Hot(_) => unimplemented!(),
-        }
-    }
 }
 
 impl ReadableAccount for StoredAccountMeta<'_> {