Document the ability store the custom dashboards generated for upstreams into folders other than general

[pszeto]

Version

1.9.x (latest)

Describe the requested changes

This PR #3920 exposed the ability to store the custom grafana dashboards generated for discovered upstreams into folders other than general. This is useful because users can annotate their upstreams and segment the dashboards into different folders instead of all of them going to General.

Example of the patch command to change the upstream:
k patch upstream -n gloo-system default-petstore-v1-8080 --type merge -p '{"metadata":{"annotations":{"observability.solo.io/dashboard_folder_id": "68"}}}'

Link to any relevant existing docs

https://docs.solo.io/gloo-edge/latest/guides/observability/grafana/dashboards/#dynamically-generated-dashboards

Browser Information

No response

Additional Context

[github-actions]

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