[Woo POS] MVP Analytics: Update receipt-related events

[iamgabrielma]

Closes: #15203

Description

This PR updates receipt-related events by:

• Updates old pos_email_receipt_tapped for new pos_receipt_email_tapped
• Updates old pos_email_receipt_send_tapped for new pos_receipt_email_send_tapped
• Adds pos_receipt_email_success, triggered on receipt success
• Adds pos_receipt_email_failed, triggered on receipt failure
• Removes sendReceiptsForPointOfSale feature flag.

In POS, go through the payment flow until you reach the success view. Then:

Testing information

Tap "Email receipt":

🔵 Tracked pos_receipt_email_tapped, properties: [plan: , site_url: https://indiemelon.mystagingwebsite.com, store_id: c5bd46cc-1804-4f7b-badb-bb98c449127f, was_ecommerce_trial: false, is_wpcom_store: false, blog_id: -1]

Tap the Send button

🔵 Tracked pos_receipt_email_send_tapped, properties: [blog_id: -1, was_ecommerce_trial: false, site_url: https://indiemelon.mystagingwebsite.com, is_wpcom_store: false, store_id: c5bd46cc-1804-4f7b-badb-bb98c449127f, plan: ]

Enter a valid email, and send it:

🔵 Tracked pos_receipt_email_success, properties: [site_url: https://indiemelon.mystagingwebsite.com, plan: , was_ecommerce_trial: false, store_id: c5bd46cc-1804-4f7b-badb-bb98c449127f, is_wpcom_store: false, blog_id: -1]

Re-run the app and repeat but throwing an error from sendReceipt() in the order controller, observe the event being tracked, and the error bubbling up to the view:

    func sendReceipt(recipientEmail: String) async throws {
        throw NSError(domain: "oopsie", code: -1)
        guard let order = order else {
            return
        }
        try await orderService.updatePOSOrder(order: order, recipientEmail: recipientEmail)
        try await receiptService.sendReceipt(order: order, recipientEmail: recipientEmail)
    }

🔵 Tracked pos_receipt_email_failed, properties: [store_id: c5bd46cc-1804-4f7b-badb-bb98c449127f, blog_id: -1, was_ecommerce_trial: false, is_wpcom_store: false, site_url: https://indiemelon.mystagingwebsite.com, plan: ]

---

• 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.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 21.8. This milestone is due in less than 2 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

	1 Message
📖	This PR contains changes to Tracks-related logic. Please ensure (author and reviewer) the following are completed: The tracks events must be validated in the Tracks system. Verify the internal Tracks spreadsheet has also been updated. Please consider registering any new events. The PR must be assigned the category: tracks label.

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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	pr15204-d3e507f
	Version	21.7
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	d3e507f
	App Center Build	WooCommerce - Prototype Builds #13040

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

[staskus]

Works well! 🚀