[Woo POS] Cancel payment after leaving POS

[staskus]

Closes: #15181
Merge after: #15207

Description

Cancel payment after leaving POS.

With these changes, memory leaks continue for me when exiting POS while in "Tap/Swipe/Insert" state. I noticed that in this instance CardPresentPaymentCollectOrderPaymentUseCaseAdaptor task cancelation and continuation are not called. I wonder if it could be a reason for the leaks, since if withCheckedThrowingContinuation is not resumed, the Task continues. Just one of the ideas.

Steps to reproduce

1. Open POS
2. Connect to the card reader
3. Check out
4. Wait for "Tap/Swipe/Insert"
5. Exit POS
6. Confirm that the payment is canceled and doesn't follow through. Previously, payment would continue. This doesn't solve a memory leak issue.

Testing information

Tested with iPad Pro 11 inch iOS 18.2 simulator.

---

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS
	Build Number	pr15205-0acbbbc
	Version	21.7
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	0acbbbc
	App Center Build	WooCommerce - Prototype Builds #13077

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[staskus]

I cannot call cancelPayment here without confusing the compiler