by default disable heavy memory profiling

[ghstack-poisoned]

Author: tianyu-l

train_configs/debug_model.toml

@@ -9,7 +9,7 @@ use_for_integration_test = true
 enable_profiling = true
 save_traces_folder = "profile_trace"
 profile_freq = 10
-enable_memory_snapshot = true
+enable_memory_snapshot = false
 save_memory_snapshot_folder = "memory_snapshot"
 
 [metrics]