[AI Plan] Summarize issue discussions
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### Release notes
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### Problem to solve
Issues are the SSOT for work that is assigned to a team and is in progress. Issues with many threads can make it challenging to understand if there are unaddressed items blocking progress or if the issue description reflects the work that is being done. This makes it challenging to easily get a high-level idea of the status of an issue at a glance.
### Proposal
Introduce AI to provide a summary of all comments/threads on an issue.
:frame_photo: Latest designs can be found in https://gitlab.com/gitlab-org/gitlab/-/issues/407887+
### Demo
- https://www.loom.com/share/bc44f4d7bb52435ba99941f26a7b4ebc
### Designs
[❖ View working file in Figma →](https://www.figma.com/file/Jb7Fov5I5lLTJbdOKhUekH/%5BAI-Plan%5D-Summarize-issue-discussions-%2610344?type=design&node-id=2606%3A11623&mode=design&t=uU9eHwKlSKdduGg9-1)
### Intended users
This feature would be useful for anyone that interacts with issues on a regular basis, which is most personas. If I were to target one it would be `Dakota` since they are someone who is not "in the weeds" and wants a quick summary.
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* [Dakota (Application Development Director)](https://about.gitlab.com/handbook/product/personas/#dakota-application-development-director)
* [Dana (Data Analyst)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#dana-data-analyst)
* [Eddie (Content Editor)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#eddie-content-editor)
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### Feature Usage Metrics
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