A callback function allowing tests to simulate user interaction with the expanded record picker UI. The testing library will invoke this function whenever the Extension under test uses the expandRecordPickerAsync function, and the return value of this function will be provided to the Extension under test as the Record that the simulated user selected.
type PickRecord = function (tableId: string, recordIds: Array<string>, fieldIds: Array<string> | null, shouldAllowCreatingRecord: boolean) => RecordId | null