Support filter by status

[schogges]

Description

It's often times useful to filter by status of dataplanes.

This currently doesn't work well because the filter doesn't act on insights.

kuma/pkg/api-server/resource_endpoints.go

Line 333 in db0fffb

list, err = r.MergeInOverview(list, insights)

We do filter well on insights:

kuma/pkg/api-server/resource_endpoints.go

Line 329 in db0fffb

if err := r.resManager.List(request.Request.Context(), insights, store.ListByMesh(meshName), store.ListByNameContains(nameContains), store.ListByFilterFunc(filter)); err != nil {

But we merge with the assumption that the resource list is the source of truth:

kuma/pkg/api-server/resource_endpoints.go

Line 353 in db0fffb

items := r.descriptor.NewOverviewList()

So there's a few ways to go about:

1. Don't include resources when they don't have insights.

[slonka]

Triage: let's do this