chore(kuma-cp) update some TODO comments

[jpeach]

Summary

Update some comments.

Full changelog

N/A

Issues resolved

N/A

Documentation

N/A

Testing

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

Backwards compatibility

• Add backport-to-stable label if the code is backwards compatible. Otherwise, list breaking changes.

[codecov-commenter]

Codecov Report

Merging #3141 (f2c2ffb) into master (f3cf03d) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3141      +/-   ##
==========================================
+ Coverage   52.32%   52.33%   +0.01%     
==========================================
  Files         923      923              
  Lines       53578    53576       -2     
==========================================
+ Hits        28033    28039       +6     
+ Misses      23313    23301      -12     
- Partials     2232     2236       +4     

Impacted Files	Coverage Δ
pkg/plugins/runtime/gateway/listener_generator.go	92.85% <ø> (+2.53%)	⬆️
...s/runtime/gateway/route_configuration_generator.go	86.66% <ø> (ø)
...g/plugins/runtime/gateway/route_table_generator.go	100.00% <ø> (ø)
pkg/plugins/runtime/gateway/cluster_generator.go	88.69% <100.00%> (ø)
pkg/plugins/runtime/gateway/route/configurers.go	82.87% <100.00%> (+0.07%)	⬆️
pkg/core/runtime/component/component.go	81.13% <0.00%> (-7.55%)	⬇️
pkg/core/resources/manager/cache.go	85.71% <0.00%> (-2.60%)	⬇️
pkg/mads/v1/client/client.go	41.25% <0.00%> (-2.50%)	⬇️
pkg/core/resources/model/rest/resource.go	67.94% <0.00%> (-1.29%)	⬇️
api/observability/v1/mads.pb.go	34.53% <0.00%> (-1.04%)	⬇️
... and 5 more

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