Add field/validation/behavior change to API review requirements

[liggitt]

/cc @smarterclayton

xref #3261 (review)

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
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/lifecycle stale

[fejta-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.

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/lifecycle rotten

[cblecker]

@liggitt Is this still important?

[liggitt]

Yes

[cblecker]

/remove-lifecycle rotten

[smarterclayton]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liggitt, smarterclayton

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