Add API Support to Retrieve Logged-in User's Role Key (Name)

User Story

There is currently no API endpoint in dotCMS that returns the role key (name) of the currently logged-in user. The existing /api/v1/users/current endpoint only returns the roleId, which is environment-specific and cannot be reliably used for frontend.

A customer is developing a custom frontend plugin and requires the role key of the current user (e.g., CMSADMIN, CONTENTEDITOR) to implement RBAC. Since role IDs vary across environments, the role key is essential for consistent permission logic.

Acceptance Criteria

Enhance the /api/v1/users/current endpoint to include:

{
  "roleKey": "CMS_ADMIN"
}

Alternatively, provide a new endpoint or a view tool accessible in frontend plugins that can return the current user's role key.

Proposed Objective

Core Features

Proposed Priority

Priority 3 - Average

External Links... Slack Conversations, Support Tickets, Figma Designs, etc.

https://dotcms.freshdesk.com/a/tickets/31130

Assumptions & Initiation Needs

No response

Quality Assurance Notes & Workarounds

No response

Sub-Tasks & Estimates

No response