feat(kuma-cp) CA backend stats in Dataplane and Mesh Insights

[jakubdyszkiewicz]

Summary

Bring CA stats to DataplaneInsights and MeshInsights

Full changelog

• Add backend to mtls part of DataplaneInsight
• Add mtlsBackends to MeshInsights which aggregates stats about dataplanes

Issues resolved

No issue

Documentation

• docs(http-api) new fields in dataplane and mesh insights kuma-website#505

Testing

• Unit tests
• E2E tests
• Manual testing on Universal
• Manual testing on Kubernetes

Backwards compatibility

• No backporting. This will be used for the next major

[codecov-commenter]

Codecov Report

Merging #2562 (c77d4fc) into master (a931218) will increase coverage by 0.12%.
The diff coverage is 66.20%.

@@            Coverage Diff             @@
##           master    #2562      +/-   ##
==========================================
+ Coverage   52.16%   52.28%   +0.12%     
==========================================
  Files         869      869              
  Lines       48568    48685     +117     
==========================================
+ Hits        25337    25457     +120     
+ Misses      21185    21178       -7     
- Partials     2046     2050       +4     

Impacted Files	Coverage Δ
api/mesh/v1alpha1/mesh_insight.pb.go	31.00% <21.42%> (-2.51%)	⬇️
pkg/xds/secrets/ca_provider.go	62.50% <40.00%> (ø)
pkg/xds/secrets/identity_provider.go	64.70% <40.00%> (ø)
pkg/xds/server/callbacks/dataplane_status_sink.go	64.19% <75.00%> (+2.86%)	⬆️
pkg/insights/resyncer.go	67.66% <81.25%> (+3.56%)	⬆️
pkg/xds/secrets/secrets.go	83.33% <86.66%> (+0.53%)	⬆️
api/mesh/v1alpha1/dataplane_insight.pb.go	43.48% <100.00%> (+1.46%)	⬆️
api/mesh/v1alpha1/dataplane_insight_helpers.go	81.48% <100.00%> (+8.83%)	⬆️
app/kumactl/cmd/inspect/inspect_dataplanes.go	94.17% <100.00%> (+1.86%)	⬆️
pkg/test/xds/secrets.go	92.85% <100.00%> (ø)
... and 12 more

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[lahabana]

Still looking good except the failed copy/paste I think