Add kubectl toolchain for linux arm64

[fengye87]

This should resolve #641

[k8s-ci-robot]

Hi @fengye87. Thanks for your PR.

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[chases2]

/approve
/ok-to-test

[fengye87]

@chases2 It looks like e2e test has failed, but I cannot tell if it's related to this patch (probably not). Could you take a look please?

[fejta]

/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chases2, fejta, fengye87

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