DOCS-2755: Ingress gateway dashboard

[ctauchen]

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[Copilot]

Pull request overview

This PR adds documentation for a new "Ingress Gateway L7" dashboard to the Calico Enterprise observability section. This dashboard provides visibility into ingress gateway traffic handling, request performance, error tracking, and application connectivity.

Key Changes

• Added a new dashboard section documenting the "Ingress Gateway L7" dashboard
• Included description of the dashboard's purpose and capabilities
• Added screenshot reference for the new dashboard

[Copilot]

The "Ingress Gateway L7" dashboard documentation should also be added to the Calico Cloud dashboards page at calico-cloud/observability/dashboards.mdx. Since Calico Ingress Gateway is available in Calico Cloud (as seen in the extensive documentation at calico-cloud/networking/ingress-gateway/), and the feature flow typically goes from Enterprise to Cloud, this dashboard should be documented for both products.