[KAL] Enable the requiredfields linter

[richardcase]

trafficstars

Enable the requiredfields linter.

Requires #5494

[richardcase]

/area api /triage accepted /help

[k8s-ci-robot]

@richardcase: This request has been marked as needing help from a contributor.

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/area api /triage accepted /help

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[richardcase]

/priority important-soon /milestone v2.9