[AT-82]: quizzes asa message

[dmitrycnstrc]

Summary

• Display quiz_asa_results_message from the quiz results API response instead of the default response summary ("Based on your answers...") on the results page
• Falls back to the existing matched-options summary when the field is null or absent
• Added Storybook story to preview the ASA message behavior

Test plan

•  Verify ASA message renders when quiz_asa_results_message is present in the API response
•  Verify default response summary renders when quiz_asa_results_message is null
•  Verify default response summary renders when quiz_asa_results_message is absent from the response
•  Check Storybook story QuizResultsPageWithAsaMessage displays the ASA message correctly

[Copilot]

Pull request overview

Copilot reviewed 9 out of 10 changed files in this pull request and generated no new comments.