FE: Display mapped agents in the group agents section of Remote Development Settings

MR: Display mapped agents in Workspaces settings (!152216 - merged)

Description

As a group maintainer, owner, or instance administrator, I want to see the agents that are available for usage in Remote Development for a given group in the "Remote Development" group settings page.

Pagination is NOT necessary at this point.

Acceptance Criteria

• A table displays all agents directly mapped to a group.
• The table has an empty state when there aren't agents mapped to the group.
• The table looks good on mobile screens.

Design Requirements

The following image provides a visual description of how agents should be displayed in the Settings page.