updateQuestion replaces a question item’s title, description, question
configuration, and optional grading without changing its item or question ID.
Example
Inputs
form, itemReference (item ID or one-based position), title, and question
are required. description, grading, and requiredRevisionId are optional;
question and grading types match Add question.
account optionally selects the Google account binding.
Output
Returns the complete updatedForm. The action fails if the selected item is
not a standalone question item; use updateItem for grids and other item kinds.