Show warning notification when NACKs happen on global

[kleinfreund]

Description

(Someone to add more details here)

[jakubdyszkiewicz]

What I can imagine is that if we see any rejection https://github.com/kumahq/kuma/blob/master/api/system/v1alpha1/zone_insight.proto#L107
We show "⚠️" on list of zones or in list of connections which would say something like "Zone CP rejected the configuration, check Zone CP logs for details".

The only problem now is that we could trigger this with the initial KDS connection where Mesh is synced with policies. Because of lack of KDS order Zone CP can receive policies before mesh and NACKs them.

We could consider adding something like "last_rejection_timestamp" so if NACK is "one of" the warning in the GUI would go away.

[github-actions]

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