Redesign the "Who" Page

We need to redesign the "Who" page to improve user role visibility, reduce duplication, and provide a better experience for our users. Currently, users may be listed multiple times if they have multiple roles, which can be confusing and cluttered.

Note that we will be introducing a new section for the security team where all committers and Pl could be included. This will become a bigger problem once that feature is deployed to production

See the issue below for more info:
#336 (comment 2549931)

Proposed Solution:

• List each user only once and display all their roles.
• Include a filter to show users based on specific roles, such as:
  • Security team
  • Committers (CM)
  • Project Leads (PL)
• The default view should list all users with their respective roles.