Update vue admin users avatar links

What does this MR do?

Part of Migrate admin/users to Vue MVP &4961 (closed).

Enabled by the recent update gitlab-ui!1964 (merged) we can now have two links on the user avatar, one for the user path and another for the user's email.

Local Testing & Setup

1. Enable the development feature flag in rails console Feature.enable(:vue_admin_users)
2. Visit the /admin/users page to view the component

Screenshots (strongly suggested)

Kapture_2021-02-05_at_16.49.55

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry - Behind development flag
• [-] Documentation (if required) - Behind development flag
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team