Allow instance admins to create shared Kubernetes agents for workspaces across multiple top-level groups

Problem

Currently, Kubernetes GitLab agents for workspaces are scoped to individual top-level groups. Instance admins cannot create a single agent that is available and usable across multiple top-level groups.

Each top-level group must create and manage their own agent configuration, leading to:

• Duplicate agent configurations across groups
• Increased operational overhead for managing multiple agent instances
• Complexity in managing workspace infrastructure across organizational units

Proposed Solution

Allow instance admins to create and manage shared Kubernetes agents at the instance level that can be used by multiple top-level groups for workspace creation.

This would enable:

• A single agent configuration that serves multiple top-level groups
• Simplified agent management for organizations with multiple top-level groups
• Reduced duplication of agent setup and configuration

Use Case

An organization with multiple top-level groups (e.g., different departments or business units) wants to use a single Kubernetes agent for workspaces without requiring each group to maintain separate agent configurations.