Jetpack AI: Persist thumbs up/down rating in Write Brief

[mwatson]

Currently you can get a suggestion from Write Brief, click thumbs up or down, and then close the popover. Once you go back to the highlighted text the popover will re-appear with the same suggestion, however the rating will not be persisted and you can re-rate the AI again.

[github-actions]

OpenAI suggested the following labels for this issue:

• [Feature Group] User Interaction & Engagement: The issue discusses user ratings and how users interact with the AI suggestions.
• [Feature] AI: The issue is directly related to the AI tools in the post and site editor, specifically concerning the Write Brief feature.
• [Feature] Likes: The problem is about persisting the thumbs up/down ratings given by users, which relates to the Likes feature.