use protobuf content type instead of json for k8s client

[bhavi-koduru]

Is this a bug fix or adding new feature?

What is this PR about? / Why do we need it?
This MR is a part of effort to elevate single eks cluster performance by migrating the EKS components to use protobuf instead of json.

Modify kubeconfig type to use content type application/vnd.kubernetes.protobuf instead of json for performance gain.

What testing is done?

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @bhavi-koduru. Thanks for your PR.

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[mskanth972]

/ok-to-test

[bhavi-koduru]

/retest

[bhavi-koduru]

/retest

[bhavi-koduru]

/retest

[mskanth972]

Fix for build issue has been merged, you can rebase and trigger the tests

[mskanth972]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bhavi-koduru, mskanth972

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