Return actual committed transactions from process_transactions() (backport #22802) (#22904)

* Return actual committed transactions from process_transactions()

* resolve conflicts

* fixup comment

* Fixup banking_stage-dropped_tx_before_forwarding counter

* Count cost model throttled transactions

* fixup tx_count moved

* Fixup tests

* remove qos service

* Cleanup clippy

Co-authored-by: Carl Lin <carl@solana.com>

program-test/src/lib.rs

@@ -428,8 +428,9 @@ fn setup_fee_calculator(bank: Bank) -> Bank {
     bank.commit_transactions(
         &[],     // transactions
         &mut [], // loaded accounts
-        &[],     // transaction execution results
-        0,       // tx count
+        vec![],  // transaction execution results
+        0,       // executed tx count
+        0,       // executed with failure output tx count
         1,       // signature count
         &mut ExecuteTimings::default(),
     );