Fix FileUpload.copy() to prevent title length exceeding 100 chars (#13968)

Fixes #11314

When copying a FileUpload, the copy() method appends ' - clone-{hash}'
(17 characters) to the title without checking if it would exceed the
database max_length constraint of 100 characters. This causes a
DataError when copying tests with files that have long names.

The fix truncates the original title before appending the clone suffix
to ensure the total length never exceeds 100 characters.

Author: valentijnscholten

dojo/models.py

@@ -803,7 +803,12 @@ def delete(self, *args, **kwargs):
     def copy(self):
         copy = copy_model_util(self)
         # Add unique modifier to file name
-        copy.title = f"{self.title} - clone-{str(uuid4())[:8]}"
+        # Truncate title to ensure it doesn't exceed max_length (100) when appending suffix
+        # Suffix " - clone-{8 chars}" is 17 characters, so truncate to 83 chars
+        clone_suffix = f" - clone-{str(uuid4())[:8]}"
+        max_title_length = 100 - len(clone_suffix)
+        truncated_title = self.title[:max_title_length] if len(self.title) > max_title_length else self.title
+        copy.title = f"{truncated_title}{clone_suffix}"
         # Create new unique file name
         current_url = self.file.url
         _, current_full_filename = current_url.rsplit("/", 1)