Further refactor to ngrx/data

[ccremer]

Summary

This is the last PR that migrates the remaining Kubernetes entities to ngrx/data services. Functionally nothing changes for the user, but should make maintenance easier.

Checklist

• [x] Categorize the PR by setting a good title and adding one of the labels: bug, enhancement, documentation, change, breaking, as they show up in the changelog
• [x] Update tests.
• [x] Link this PR to related issues.

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