[Mobile Payments] Groundwork for refactor of CollectOrderPaymentUseCase

[joshheald]

Part of: #8080

Description

This makes no functional changes, and the code added is not yet called.

I've duplicated the CollectOrderPaymentUseCase ready for the planned refactor which will make Tap on Mobile easier. See pdfdoF-1My-p2 for full context.

The existing use case has been renamed LegacyCollectOrderPaymentUseCase, and when the refactor is complete and we switch over to it, this will be deleted.

CollectOrderPaymentUseCase is now the go-forward class, and I'll perform the refactor there and in other related files.

Testing instructions

Check that unit tests pass, and that you can still take a Card Present payment.

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-woocommerce]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 2 days Please, make sure to get it merged by then or assign it to a later expiring milestone

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[wpmobilebot]

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• Then installing the build number pr8184-78e418f on your iPhone

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[joshheald]

@toupper Sorry it's long. This is groundwork only: it duplicates the use case ready to start refactoring it, and the duplicate isn't even accessible. So it should be quick to test, and it's not worth reviewing the additional use case as it isn't any different from the existing one yet.

The plan is that this should make it a bit easier to pick out the changes in the refactor.

[toupper]

It looks good and tests well 🎉