Design: Configure Metrics dashboard related links via GitLab UI

Problem to solve

As part of #202166 (closed) we're allowing the user to define dashboard related links in a .yml.

An easier way to add links to a dashboard would be via GitLab UI. This design issue is find an optimal way to set up the dashboard link.

Intended users

User experience goal

"As a user I'd like an easy and quick way to set up dashboard links in GitLab"

Proposal

Further details

Permissions and Security

Documentation

This 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