fix: normalize ETag comparison in multipart upload and replication (#627)

- Normalize ETags by removing quotes before comparison in complete_multipart_upload
- Fix ETag comparison in replication logic to handle quoted ETags from API responses
- Fix ETag comparison in transition object logic
- Add unit tests for trim_etag function

This fixes the ETag mismatch error when uploading large files (5GB+) via multipart upload,
which was caused by PR #592 adding quotes to ETag responses while internal storage remains unquoted.

Fixes #625

crates/utils/src/path.rs

@@ -276,6 +276,27 @@ pub fn trim_etag(etag: &str) -> String {
 mod tests {
     use super::*;
 
+    #[test]
+    fn test_trim_etag() {
+        // Test with quoted ETag
+        assert_eq!(trim_etag("\"abc123\""), "abc123");
+
+        // Test with unquoted ETag
+        assert_eq!(trim_etag("abc123"), "abc123");
+
+        // Test with empty string
+        assert_eq!(trim_etag(""), "");
+
+        // Test with only quotes
+        assert_eq!(trim_etag("\"\""), "");
+
+        // Test with MD5 hash
+        assert_eq!(trim_etag("\"2c7ab85a893283e98c931e9511add182\""), "2c7ab85a893283e98c931e9511add182");
+
+        // Test with multipart ETag format
+        assert_eq!(trim_etag("\"098f6bcd4621d373cade4e832627b4f6-2\""), "098f6bcd4621d373cade4e832627b4f6-2");
+    }
+
     #[test]
     fn test_base_dir_from_prefix() {
         let a = "da/";