FE: Display a warning message when a cluster agent is already mapped/unmapped

MR: Display warning when agent is already blocked o... (!155843 - merged)

Description

As a user, when I'm trying to map a cluster agent to a group and the cluster agent is already mapped, I want to see a warning message that communicates this state. The same requirement applies for the unmap operation.

Acceptance Criteria

• If the user attempts to map a cluster agent to a group, and the cluster agent is already mapped, display a warning alert indicating that the agent is already mapped.
• If the user attempts to unmap a cluster agent to a group, and the cluster agent is already unmapped, display a warning alert indicating that the agent is already unmapped.

Design Requirements