Fix user popover on organization users page

What does this MR do and why?

Related to #441543 (closed)

The grouptenant scale team is starting to build out an Organization MVC. For more information about what an "Organization" will be see https://docs.gitlab.com/ee/architecture/blueprints/organization/

This MR fixes a bug on the Manage -> Users page where the user popover does not load.

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Screenshots or screen recordings

Before	After

How to set up and validate locally

• Enable ui_for_organizations feature flag
  • echo "Feature.enable(:ui_for_organizations)" | gdk rails c
• Navigate to /-/organizations/default/users
• Hover over a user