Add Info icons to metric labels in the Value Stream Dashboard

What does this MR do and why?

We want to better surface metric description, docs and drill-down links in the Value Stream Dashboard.

• Convert the metric label to a GlLink which is a link to the drill-down view
• Add an info icon next to the metric label, which is now the popover target
• Remove drill-down link from the popover, improve the styling a bit

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Seed analytics data for your group (and optionally DORA metrics data)
2. Visit the value streams dashboard: http://gdk.test:3000/groups/${YOUR_GROUP}/-/analytics/dashboards
3. Validate that the metric labels/links are correct for each row of the table

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #404551 (closed)