Send Receipt After Payment: Add eligibility checker

[staskus]

Partially addresses: https://github.com/woocommerce/woocommerce-ios/issues/14163 Continuation of https://github.com/woocommerce/woocommerce-ios/pull/14422

Description

Add eligibility checking logic for sending receipts after payment functionality:

• WooCommerce from 9.5 supports API calls to actions/send_order_details to trigger sending order details email
• WooPayments from 8.6 supports sending emails to attached customers when order payment fails

Steps to reproduce

The feature flag is disabled, I think it could be enough to check unit test cases to confirm that supported scenarios are handled as expected. In the final PRs, we can test the full flows.

However, if you prefer testing live:

Eligible site

1. Enable sendReceiptAfterPayment feature flag
2. Use my testing site https://lovely-aware-sturgeon.jurassic.ninja/ details: PdfdoF-5Qj-p2
3. Create an order
4. Do not attach the customer
5. Make a payment
6. Confirm "Email receipt" button appears
7. Tap on the button
8. Input email
9. Tap the CTA
10. Confirm email appears

Ineligible site

1. Enable sendReceiptAfterPayment feature flag
2. Use a testing site that has released versions of WooCommerce and WooPayments
3. Create an order
4. Do not attach the customer
5. Make a payment
6. Confirm "Email receipt" doesn't appear (or it opens native Mail client if it's installed)

Testing information

• Added unit tests
• Tested on my site with feature flag enabled

---

• [x] 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:

• [x] 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.
• [x] Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• [x] 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	pr14446-01c94d9
	Version	21.1
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	01c94d9e1ce6d6f0e2db8dbf32df0566cdc2af9c
	App Center Build	WooCommerce - Prototype Builds #11635

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