fix: add IsNotFoundErr when get headlessSvc

[googs1025]

get client error, there are two types of errors: "NotFound" error and others. If it is a "NotFound" error, it should be created. If it is not, the original error should be returned.

[k8s-ci-robot]

Hi @googs1025. Thanks for your PR.

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[kannon92]

/ok-to-test

[kannon92]

Code looks good to me but not sure if this is the logic we want.
@ahg-g @danielvegamyhre WDYT?

[ahg-g]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, googs1025

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