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/system_instruction_processor.rs

@@ -1387,7 +1387,7 @@ mod tests {
             bank.force_flush_accounts_cache();
             // do clean and assert that it actually did its job
             assert_eq!(3, bank.get_snapshot_storages().len());
-            bank.clean_accounts(false, false);
+            bank.clean_accounts(false, false, None);
             assert_eq!(2, bank.get_snapshot_storages().len());
         });
     }