Replace prints with logs and fix grammar (#437)

* refactor: replace print statements with proper logging and fix grammar

- Fix English grammar errors in existing log messages
- Add tracing imports where needed
- Improve log message clarity and consistency
- Follow project logging best practices using tracing crate

* fix: resolve clippy warnings and format code

- Fix unused import warnings by making test imports conditional with #[cfg(test)]
- Fix unused variable warning by prefixing with underscore
- Run cargo fmt to fix formatting issues
- Ensure all code passes clippy checks with -D warnings flag

* refactor: move tracing::debug import into test module

Move the tracing::debug import from file-level #[cfg(test)] into the test module itself for better code organization and consistency with other test modules

* Checkpoint before follow-up message

Co-authored-by: anzhengchao <anzhengchao@gmail.com>

* refactor: move tracing::debug import into test module in user_agent.rs

Complete the refactoring by moving the tracing::debug import from file-level #[cfg(test)] into the test module for consistency across all test files

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

crates/ecstore/src/cmd/bucket_replication.rs

@@ -728,7 +728,7 @@ impl ReplicationPool {
             // Either already satisfied or worker count changed while waiting for the lock.
             return;
         }
-        println!("2 resize_lrg_workers");
+        debug!("Resizing large workers pool");
 
         let active_workers = Arc::clone(&self.active_lrg_workers);
         let obj_layer = Arc::clone(&self.obj_layer);
@@ -743,7 +743,7 @@ impl ReplicationPool {
 
             tokio::spawn(async move {
                 while let Some(operation) = receiver.recv().await {
-                    println!("resize workers 1");
+                    debug!("Processing replication operation in worker");
                     active_workers_clone.fetch_add(1, Ordering::SeqCst);
 
                     if let Some(info) = operation.as_any().downcast_ref::<ReplicateObjectInfo>() {