Add "View User Details" for Enterprise Users

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Background

On self-managed GitLab, we provide a "View User Details" page to admins, where they can see lots of information about a user. Ex: https://gitlab.example.com/admin/users/{handle}. We need to replicate this for User Management on GitLab.com for Enterprise Users.

Proposal

• User details are shown in a "view record" kind of view, and clicking on a user shows a list of their groups/project memberships, identities, etc.

• We already have this data available in the API, so this is about surfacing it in a UI for an Enterprise Group owner

• Other fields that must be surfaced include: (ID, Name, Username, Email, State)