getForm loads form metadata, publication state, settings, and every item. Use
it to discover stable item and question IDs before updating or routing answers.
Example
Inputs
form: string is required and accepts a form ID or standard Forms URL.
account optionally selects the Google account. Inputs accept compatible
signals.
Output
index is zero-based, while item positions accepted by editing actions are
one-based. Keep immutable itemId and questionId values when order can change.