Added toggle labels toggle to merge request dashboard

What does this MR do and why?

Adds a toggle to the merge request dashboard that will toggle the display of labels on each merge request row.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screen_Recording_2024-05-14_at_11.03.46

How to set up and validate locally

• Enable merge_request_dashboard feature flag
• Visit http://gdk.test:3000/dashboard/merge_requests