LibKGAPI uses `QMimeDatabase::mimeTypeForFileNameAndData()` for determining `content-type` (mimeType) during file uploads. Since KIO GDrive uses `QTemporaryFile`s default generated filenames, filename information is lost and some files get uploaded with a wrong mimeType (eg. docx files which are really just zip files).
This patch adds the original filename to the temporary file name used during file creation or update.
BUG 401151