[Fix-16346] Fix a bug that prevents re-uploading resource files (#16356)

Co-authored-by: JohnZp <johnzp1109@google.com>

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/validator/resource/UpdateFileDtoValidator.java

@@ -43,7 +43,9 @@ public class UpdateFileDtoValidator extends AbstractResourceValidator<UpdateFile
         User loginUser = updateFileDto.getLoginUser();
         MultipartFile file = updateFileDto.getFile();
 
-        if (!Objects.equals(Files.getFileExtension(file.getName()),
+        if (!Objects.equals(
+                Files.getFileExtension(
+                        file.getOriginalFilename() == null ? file.getName() : file.getOriginalFilename()),
                 Files.getFileExtension(updateFileDto.getFileAbsolutePath()))) {
             throw new ServiceException("file extension cannot not change");
         }