test(e2e): drop 79 no-op serial markers from six more suites (#6239)

crates/e2e_test/src/copy_object_checksum_test.rs

@@ -30,7 +30,6 @@ mod tests {
     use base64::Engine as _;
     use base64::engine::general_purpose::STANDARD as BASE64;
     use rustfs_rio::{Checksum, ChecksumType as RioChecksumType};
-    use serial_test::serial;
     use sha2::{Digest, Sha256};
     use tracing::info;
 
@@ -114,7 +113,6 @@ mod tests {
     }
 
     #[tokio::test]
-    #[serial]
     async fn test_copy_supports_all_checksum_algorithms() {
         init_logging();
 
@@ -196,7 +194,6 @@ mod tests {
     }
 
     #[tokio::test]
-    #[serial]
     async fn test_copy_without_algorithm_preserves_every_supported_source_checksum() {
         init_logging();
 
@@ -262,7 +259,6 @@ mod tests {
     }
 
     #[tokio::test]
-    #[serial]
     async fn test_copy_without_algorithm_preserves_composite_checksum_type() {
         init_logging();
 
@@ -352,7 +348,6 @@ mod tests {
     }
 
     #[tokio::test]
-    #[serial]
     async fn test_copy_rejects_unknown_algorithm_without_destination_mutation() {
         init_logging();
 
@@ -453,7 +448,6 @@ mod tests {
     /// bytes, return it in `CopyObjectResult.ChecksumSHA256`, and persist it so a checksum-mode
     /// HEAD on the destination returns the identical value.
     #[tokio::test]
-    #[serial]
     async fn test_copy_with_checksum_algorithm_returns_and_persists_sha256() {
         init_logging();
         info!("Issue #4996: CopyObject with ChecksumAlgorithm=SHA256 must return and persist the checksum");
@@ -523,7 +517,6 @@ mod tests {
     /// No algorithm requested: when the source object already carries a checksum, the copy must
     /// preserve it on the destination (AWS default), visible via a checksum-mode HEAD.
     #[tokio::test]
-    #[serial]
     async fn test_copy_without_algorithm_preserves_source_checksum() {
         init_logging();
         info!("Issue #4996: CopyObject without ChecksumAlgorithm must preserve the source object's checksum");
@@ -603,7 +596,6 @@ mod tests {
     /// checksum-not-inherited path, and exercises the CRC32 code path (a different branch of
     /// ChecksumType::from_string than SHA256).
     #[tokio::test]
-    #[serial]
     async fn test_copy_requested_algorithm_overrides_source_checksum() {
         init_logging();
         info!("Issue #4996: a requested CopyObject checksum algorithm must override the source object's algorithm");