AI Catalog: Add link to group Automate > Agents view in agent/flow enabled toast notification

Problem

When a user enables an agent or flow at the group level, a toast notification appears saying "Agent enabled in [project] at GitLab" (or similar for flows). Currently, this notification has no actionable link, leaving users unclear about next steps or how to manage the newly enabled agent/flow.

Expected Behavior

The toast notification should include a link back to the group's Automate > Agents view, similar to the UX pattern used when creating a new issue. This provides a clear path for users to:

• View the newly enabled agent/flow
• Configure settings or triggers
• Manage other agents/flows in the group

Current Behavior

Toast notification appears with confirmation text but no navigational link.

Acceptance Criteria

• Toast notification displays when an agent or flow is enabled at group level
• Toast includes a clickable link to the group's Automate > Agents view
• Link text is clear and actionable (e.g., "View in Automate" or "Go to Agents")
• UX pattern matches the new issue creation toast notification experience
• Works for both agent and flow enablement

Related Feedback

Feedback from AI Catalog issue #570717 - User noted "UX is lacking" and requested this improvement to match the new issue creation experience.