Werk #11146: Optional package: Update Prometheus to 1.1 (improve Node Exporter)

This change updates the optional extension package for the Prometheus suite. It introduces the multi-nodes processing for the Node Exporter. This allows Checkmk to handle a Prometheus instance where multiple Node Exporters are connected. If the Prometheus package v1 was already in use, you should perform a Tabula Rasa after upgrading to the package v1.1. For a first installation, you can find this package in the Extension packages page. The Prometheus package is listed as an optional extension package and becomes available to your site after performing the "Install this package" action.

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