[KAL] Enable the maxlength linter

[richardcase]

Enable the maxlength linter.

Requires #5494

[richardcase]

/area api
/triage accepted
/help

[k8s-ci-robot]

@richardcase:
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In response to this:

/area api
/triage accepted
/help

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[richardcase]

/priority important-soon
/milestone v2.9