[IPP] Delete simple payments migration flow

[kidinov]

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Ensure that the shortcut to Collect Payment from the home screen still works, going via the Orders tab without an education screen, or replace it with a Create Order action. #15428

[dangermattic]

🚫 Please add a type label (e.g. type: enhancement) and a feature label (e.g. feature: stats) to this issue.