Design: Configure Metrics chart links via GitLab UI

Problem to solve

As part of #214436 (closed) we allow our users to add links to charts via a .yml file, and view them in a chart pop-up dropdown menu.

A much more convenient way to set up these links is via GitLab UI. This is a design issue for the links configuration via GitLab UI flow.

This issue is related to #202166 (closed).

Intended users

User experience goal

"As a user I'd like to be able to quickly add links to my charts via a familiar UI."

Proposal

Further details

Permissions and Security

Documentation

This feature will require documentation.

Availability & Testing

What does success look like, and how can we measure that?

What is the type of buyer?

Is this a cross-stage feature?

Links / references