Handle cleaning of zero-lamport accounts w.r.t. Incremental Snapshots (#18870)

* Handle cleaning zero-lamport accounts

Handle cleaning zero-lamport accounts in slots higher than the last full
snapshot slot.  This is part of the Incremental Snapshot work.

Fixes #18825

runtime/src/accounts.rs

@@ -2078,7 +2078,7 @@ mod tests {
             }
         }
         info!("done..cleaning..");
-        accounts.accounts_db.clean_accounts(None, false);
+        accounts.accounts_db.clean_accounts(None, false, None);
     }
 
     fn load_accounts_no_store(accounts: &Accounts, tx: Transaction) -> Vec<TransactionLoadResult> {