compute_bank_stats needs to return newly computed ForkStats (#8608)

* Fix broken confirmation, add test

programs/vote/src/lib.rs

@@ -1,6 +1,7 @@
 pub mod authorized_voters;
 pub mod vote_instruction;
 pub mod vote_state;
+pub mod vote_transaction;
 
 #[macro_use]
 extern crate solana_metrics;