Werk #16668: Top list dashlet: Introduce best effort querying

In some rare cases, the top list dashlet does not display all available metrics due to limitations in the metric system of Checkmk.

An example of this issue can be observed when using the CPU utilization metric. When using Windows and Linux hosts at the same time, the services of these hosts conflict with each other, potentially resulting in incomplete results.

Now the top list dashlet will try to query all available metrics on a best effort basis if the results are incomplete. If some metrics are still missing, the dashlet displays an error message with the conflicting metrics.

This information can be used to identify the conflicting services and exclude them by adding more filters to the dashlet.

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