fix: match thankyou template when using existing customer email

[dkoo]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Adjusts some logic in the WooCommerce checkout flow when using the modal checkout. In the scenario where a donation is made while logged out but using an email address that's already associated with a custom account, we don't want to show the login prompt on the thank you step—instead, we want to show the order summary like we do for new email addresses or when already logged in.

How to test the changes in this Pull Request:

1. On release, while not logged in, make a donation using an email address that's already associated with an existing reader account.
2. On the thank you step after the successful transaction, observe that instead of an order summary, there's a message to "Please log in to your account to view this order" and a login form.
3. Check out this branch, repeat with a new donation and the same email address. This time confirm that the thank you page shows an order summary and no message or login form, similarly to what's shown when donating using a new email address.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[miguelpeixe]

Tests well!

[dkoo]

4d20fee adds an extra security layer using Woo's key hash which ties the order details summary to the specific transaction flow. This should prevent CSRF requests from being able to expose customer and order details using just an order ID. If the key hash isn't valid, you'll be prompted to log in, but via a link to My Account instead of an inline login form (testable by mocking the value of key on this line).

[matticbot]

🎉 This PR is included in version 1.75.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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