Remove usage of IOUReportID for IOU actions with type=PAY

[MelvinBot]

Context

Follow-up from #87530, which removes usage of IOUReportID for IOU actions of type CREATE by falling back to action?.reportID.

However, IOUReportID is still necessary for IOU actions with type=PAY. This issue tracks the work to handle the payment case and remove or reduce reliance on IOUReportID there as well.

Part of https://github.com/Expensify/Expensify/issues/601607