Werk #12034: Distributed monitoring: Prevent remote site connection with [central]_bi sites

Checkmk creates NagVis backends for all sites. For each site it creates two backends:

• [site_id] - Livestatus connection to the sites core
• [site_id]_bi - Bacned to Checkmk BI for displaying aggregation states

In case one tries to add a site with a Site-ID [central_site]_bi this will result in a name conflict between the central site BI backend and the remote site livestatus backend.

The distributed monitoring configuration prevents adding new remote sites with this name from now on.

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