[Mobile Payments] Log Stripe error codes within the CardReaderService

[joshheald]

Description

This PR adds logging for the error codes we get from Stripe, within the StripeCardReaderService, for a lower-level way to identify errors that are causing issues.

Steps to reproduce

1. Launch the app
2. Turn off bluetooth on your device
3. Navigate to Menu > Payments > Manage card reader
4. Tap Connect card reader if needed
5. Observe the error is shown
6. Check the logs (Xcode console, or Menu > Settings > Help & Support > View Application Log > Current)
7. Observe that you see a log for 💳 Stripe Error Code: SCPError(rawValue: 2320)

Testing information

Some errors don't originate from Stripe. If they don't, they'll default to being tracked with code 1. I've written some pattern matching logic to try to avoid this, but it's not feasible to test every situation here.

No unit testing because the StripeCardReaderService is not structured for unit tests, due to the impracticality of mocking the Stripe Terminal.

---

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

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on all devices (phone/tablet) and no regressions are added.

[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	pr13976-ade241b
	Version	20.4
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	ade241b
	App Center Build	WooCommerce - Prototype Builds #10892

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[staskus]

👍 Thanks for the work!

Tested, I confirm that stripe payment errors are now logged .

[staskus]

Unused

Suggested change

let nsError = error as NSError