fix/85: unblock UI and show generic error when buyer verification fails

[Sidsector9]

All Submissions:

• Does your code follow the WooCommerce Sniffs variant of WordPress coding standards?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Will this change require new documentation or changes to existing documentation?

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Changes proposed in this Pull Request:

This PR unblocks the UI and shows a generic error on the Checkout page when the buyer verification fails.

Closes #85

Steps to test the changes in this Pull Request:

1. On trunk, perform a Checkout with the card 4310 0000 0020 1019.
2. Cancel the verification Challenge once it shows up.
3. Observe the Checkout page being blocked.
4. Switch to the fix branch and repeat.
5. Observe the Checkout page is unblocked and the page shows a generic error.

Changelog entry

Fix - Unblock the Checkout page UI, and show a generic error when buyer verification fails.

[dkotter]

This can go to UAT once QA passes

[qasumitbagthariya]

QA Update ✅

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I have verified this PR in the fix/85 branch which has been fixed and is functioning as intended.

Testing Environment

• WordPress: 6.7.1
• Theme: Twenty Twenty-Four 1.3
• WooCommerce - 9.5.1
• PHP: 8.0.30
• Web Server: Nginx 1.20.2
• Browser: Chrome
• OS: macOS Ventura 15.2
• Branch: fix/85

Screen.Recording.2025-01-13.at.7.41.37.PM.mov

Steps to Test- As mentioned in the PR description.
Test Results - It is working as expected.
Functional Demo / Screencast -
Special Notes - Ready for UAT
Testing Document status:
Cases related to this Issue/PR are added to the Critical Flow Wiki pages:

• Yes
• Not Required/Applicable for this PR

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