[DNM] Multicluster - Istio Config validations #6058
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RFE #5967
Subtask: #6056
Istio config list and details shows validations from remote clusters.
Added missing cluster param in several places, put default values for metrics.
One issue I noticed, when opening config pages, then going to Overview page, there were failures in loading metrics, and not all namespaces are loaded.
For this I did put 'cluster' param's value to home cluster in some places with TODO as I added more subtasks in #5618
Also disabled loading namespaces from cache, because it was loading only home cluster cache after some point.