Update golangci-lint to v2

[tylerauerbeck]

Kustomize currently uses v1 of golangci-lint. The current stable release is v2.1.6 and includes a number of improvements, including updated linters.

This update also includes migrating to a new configuration format.

[k8s-ci-robot]

This issue is currently awaiting triage.

SIG CLI takes a lead on issue triage for this repo, but any Kubernetes member can accept issues by applying the triage/accepted label.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

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