Give webdav plugin a clean temp directory

Co-authored-by: mvdbeek <[email protected]>

lib/galaxy/files/sources/webdav.py

@@ -27,7 +27,7 @@ def _open_fs(self, user_context=None, opts: Optional[FilesSourceOptions] = None)
         if use_temp_files is None:
             # Default to True to avoid memory issues with large files.
             props["use_temp_files"] = True
-            props["temp_path"] = props.get("temp_path", tempfile.gettempdir())
+            props["temp_path"] = props.get("temp_path", tempfile.TemporaryDirectory(prefix="webdav_"))
         extra_props: Union[FilesSourceProperties, dict] = opts.extra_props or {} if opts else {}
         handle = WebDAVFS(**{**props, **extra_props})
         return handle