Use positive/negative sentiment feedback component for AI comment feedback
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# Proposal
As a follow up to #521724 this issue proposes an alternative to using the standard emoji reactions in favor of feedback mechanisms that could be reused by GitLab Duo features:
- An area for actions related to the AI response
- An area for feedback associated to the specific response
- Controls would be specific per user

## Tooltips to inform usage
This approach of using buttons conveys action but in doing so it might not be clear to all what :thumbsup: and :thumbsdown: mean. To help with that scenario we would display tooltips on hover of the buttons.
This example is specific to the goals of #521724. By using buttons & tooltips we achieve the messaging goals with fewer elements visible at one time on the screen.
| Mention GitLabDuo for questions | Positive feedback |
| ------ | ------ |
|  |  |
## Feedback capture
To give user feedback that the rating was received we could use a toast.
Additionally the industry uses this feedback pattern of thumbs up/down as a way to invoke a feedback form. This is optional for the goals of #521724. There are valid concerns that I share that [having a form could be a burden](https://gitlab.com/gitlab-org/gitlab/-/issues/521724#note_2383462304) from capturing the general sentiment even if the description is optional.
| Toast | Could open form that on Submit would show toast (optional) |
| ------ | ------ |
|  |  |
## Rated state
When a rating is received, the simplest thing to do is to treat the thumbs up/down button as toggle buttons like we do with our editor toolbar for actions like bold/italic/strikethrough.
This allows the user to change their mind on the rating. Once selected I don't think a user can remove the fact that they rated a diff comment. In the example below it is showing a rating of "positive feedback".

## Alongside emoji reactions
#521724 correctly recognizes that users do want to give feedback to the responses. However we risk conflating what emoji reactions already means to users and having a feedback capture for AI responses. By introducing a separate mechanism for AI response actions and feedback we don't need to create extra logic/conditions around emoji reactions https://gitlab.com/gitlab-org/gitlab/-/issues/521724#note_2382085575.
We could have a dedicated feedback component to add to the GitLab Duo feedback.
The example below shows how the feedback mechanism with a positive feedback rated would sit along side emoji reactions. By using icons and emojis these concepts of rating and reaction are separated.

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