Move Service Desk panels to Respond dashboard

What

Move the existing Service Desk panels from the Product Planning dashboard to the Respond dashboard. The panels have not been modified, just moved.

Update link in Service Desk runbook.

Why

Service Desk: move Grafana panels to Respond da... (gitlab-org/gitlab#398166 - closed)

Service Desk is owned by grouprespond, not groupproduct planning.

Testing

Snapshot dashboards to validate the change:

Merge request reports

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