Report total_transactions in replay-slot-stats (#28382)

We have transactions counted in replay-slot-end-to-end-stats, but that
metric is broken down to report things per thread.

So, report total_transactions for the entire slot (all threads) in
replay-slot-stats.

core/src/progress_map.rs

@@ -39,6 +39,7 @@ impl ReplaySlotStats {
     pub fn report_stats(
         &self,
         slot: Slot,
+        num_txs: usize,
         num_entries: usize,
         num_shreds: u64,
         bank_complete_time_us: u64,
@@ -71,6 +72,7 @@ impl ReplaySlotStats {
                     i64
                 ),
                 ("bank_complete_time_us", bank_complete_time_us, i64),
+                ("total_transactions", num_txs as i64, i64),
                 ("total_entries", num_entries as i64, i64),
                 ("total_shreds", num_shreds as i64, i64),
                 // Everything inside the `eager!` block will be eagerly expanded before

core/src/replay_stage.rs

@@ -2564,6 +2564,7 @@ impl ReplayStage {
 
                 r_replay_stats.report_stats(
                     bank.slot(),
+                    r_replay_progress.num_txs,
                     r_replay_progress.num_entries,
                     r_replay_progress.num_shreds,
                     bank_complete_time.as_us(),