Work item - Open design on click

What does this MR do and why?

• Adds navigating to Work Item design when clicking on thumbnail in design widget. The view is very basic, no top bar, no sidebar.
• Pressing Escape closes the design and navigates back to the work item
• Design URL can be linked directly

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

Velit_ipsam_voluptatem_est_maxime_sit_non_voluptas_veniam_minus_omnis.___Issue___gitlab-org_gitlab-shell

How to set up and validate locally

1. Visit an issue and upload a design to it.
2. Visit the work item equivalent to that issue and verify that designs are being displayed.
3. Click on a design to open it.
4. Refresh the page to verify the URL corresponds to the design
5. Press Escape to close the design.

• Issue example URL: http://127.0.0.1:3000/gitlab-org/gitlab-shell/-/issues/2
• Corresponding work item URL: http://127.0.0.1:3000/gitlab-org/gitlab-shell/-/work_items/2

Related to #460184 (closed)