Update FrontendConfig v1beta1 API so that Spec and Status fields are optional

[spencerhance]

This matches the same behavior of the BackendConfig CRD

This will also need to be cherry picked into v1.9

/assign @bowei

[k8s-ci-robot]

Hi @spencerhance. Thanks for your PR.

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[bowei]

/ok-to-test

[bowei]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bowei, spencerhance

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[bowei]

Is this all of the generated files?

[spencerhance]

@bowei Yes that's everything that the hack/ script updated