Migrate GlDropdown to GlCollapsibleListbox in confidential merge request

Tan Lerequested to merge
384294-migrate-confidential-mr-collapsible-list-box into master

What does this MR do and why?

This MR migrates GlDropdown & GlDropdownItem used in confidential merge request to GlCollapsibleListbox component.

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. Fork a project, e.g. gitlab-shell and set the Visibility level of Private.
  2. Navigate to a confidential issue (see detailed instructions).
  3. Select Create confidential merge request.
  4. Observe the new project listbox ✨

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 #384294 (closed)

Edited by Tan Le

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