feat(AI): create page for ai feedback

What does this MR do?

The MR creates a page in design.gitlab.com to provide guidelines on how we collect feedback on the AI's output in the UI. The current solution was informed by research, which is described in this issue.

The purpose of documenting this guidance is to encourage consistency across the product and explain why the feedback form is our current iteration (it was formally 👍 👎 buttons).

The solution in this MR may evolve. @veethika is exploring some design improvements. When those improvements are finalized, we could update this page.

Does this MR meet the acceptance criteria?

• The MR title and commit messages meet the Pajamas commit conventions.
• The “What does this MR do?” section in the MR description is filled out, explaining the reasons for and scope of the proposed changes, per “Say why not just what”.
  • For example, if the MR is focused on usage guidelines, addressing accessibility challenges could be added in a separate MR.
• Relevant label(s) are applied to the MR.
• The MR is added to a milestone.
• If creating a new component page from scratch, it follows the page template structure.
• Content follows the Pajamas voice and tone guidelines, falling back on the GitLab Documentation Style Guide when needed.
• Related pages are cross-linked, where helpful. Component pages have related components and patterns defined in their Markdown front matter.
• If embedding a Figma file, it follows the Figma embed guide.
• Review requested from any GitLab designer or directly from a maintainer or trainee maintainer.
• Maintainer review follows the Pajamas UX maintainer review checklist.

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