feat(scyllaclient_test): benchmark RcloneListDirIter

The main focus of this benchmark is to test the impact of the issues:
- #4134
- #4133
- #4132

pkg/testutils/s3.go

@@ -46,6 +46,7 @@ func S3Credentials() (provider, endpoint, accessKeyID, secretAccessKey string) {
 	return *flagS3Provider, *flagS3Endpoint, *flagS3AccessKeyID, *flagS3SecretAccessKey
 }
 
+// S3BucketPath returns the os path to the bucket.
 func S3BucketPath(bucket string) string {
 	if !flag.Parsed() {
 		flag.Parse()