[Mobile Payments] Payment flow continues to show "Collect Payment" after payment method details are collected

[joshheald]

2. The "Collect Payment" popup appears after I've paid via tap to pay, and if I'm quick enough, I can cancel the transaction at this point. This is different from using a bluetooth reader, where the user is immediately brought to the receipt popup. It just seems odd that I can do that.

Originally posted by @lmischner in #8273 (comment)

This applies to both bluetooth and tap on mobile payments, and happens in the existing flow too. Changes to the StripeCardReaderService (required) won't be feature flagged by the Tap to Pay on iPhone flag.

See notes added in StripeCardReaderService and CollectOrderPaymentUseCase