Migrate GlDropdown to GlCollapsibleListbox in admin projects page

Tan Lerequested to merge
384292-migrate-admin-projects-collapsible-list-box into master

What does this MR do and why?

This MR migrates GlDropdown & GlDropdownItem used in admin projects page to GlCollapsibleListbox component.

I have opted to replace the Any namespace selection with the Clear button since it is more or less to achieve the same thing 🤔.

Screenshots or screen recordings

Screen Before After
Desktop desktop_before desktop_after
Mobile mobile_before mobile_after

How to set up and validate locally

  1. Navigate to the admin projects page (http://gdk.test:3000/admin/projects)
  2. Observe the new projects listbox ✨
  3. Ensure that the URL is updated upon selection

MR acceptance checklist

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

Related to #384292 (closed)

Edited by Tan Le

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