dashboard: include thresholds/submetrics

[urugator]

Feature Description

Thank you for the built-in dashboard/html report feature, it's very appreciated. Atm the summary is missing thresholds/submetrics I would love to see these included similary to the default text summary:

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[Relex28]

This is also related to my question and feature request https://github.com/grafana/xk6-dashboard/issues/49