fix(kumactl): don't show builtin gateway spuriously offline

[michaelbeaumont]

Summary

Gateways don't have inbounds.

[codecov-commenter]

Codecov Report

Merging #3465 (b6c7295) into master (9dbcf4d) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3465      +/-   ##
==========================================
- Coverage   52.31%   52.30%   -0.02%     
==========================================
  Files         940      940              
  Lines       54445    54445              
==========================================
- Hits        28484    28478       -6     
- Misses      23739    23751      +12     
+ Partials     2222     2216       -6     

Impacted Files	Coverage Δ
.../resources/apis/mesh/dataplane_overview_helpers.go	100.00% <100.00%> (ø)
pkg/insights/components.go	70.00% <0.00%> (-30.00%)	⬇️
pkg/events/eventbus.go	85.18% <0.00%> (-7.41%)	⬇️
pkg/insights/resyncer.go	67.22% <0.00%> (-2.68%)	⬇️
pkg/core/resources/manager/cache.go	83.11% <0.00%> (-2.60%)	⬇️
api/observability/v1/mads.pb.go	35.56% <0.00%> (+1.03%)	⬆️
pkg/xds/generator/direct_access_proxy_generator.go	85.88% <0.00%> (+1.17%)	⬆️
pkg/mads/v1/client/client.go	43.75% <0.00%> (+2.50%)	⬆️
pkg/core/runtime/component/component.go	88.67% <0.00%> (+7.54%)	⬆️

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[jpeach]

Noice catch!