Reset program cache stats after submit (#31929)

program-runtime/src/loaded_programs.rs

@@ -170,6 +170,10 @@ impl Stats {
             );
         }
     }
+
+    pub fn reset(&mut self) {
+        *self = Stats::default();
+    }
 }
 
 #[derive(Debug, Default)]

runtime/src/bank.rs

@@ -1681,6 +1681,7 @@ impl Bank {
             .stats
             .submit(parent.slot());
 
+        new.loaded_programs_cache.write().unwrap().stats.reset();
         new
     }