feat: add deadcode linter in golangci-lint

[kushthedude]

Signed-off-by: Kush Trivedi [email protected]

Refers #1244

[k8s-ci-robot]

Hi @kushthedude. Thanks for your PR.

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[kushthedude]

/assign @wojtek-t

[wojtek-t]

/ok-to-test

[wojtek-t]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kushthedude, wojtek-t

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