🏃 AddToProtobufScheme: Take AddToScheme, not Schemebulilder

[alvaroaleman]

Depending on the API, the SchemeBuilder might not be exported. Since we
only care about its AddToScheme, take that as argument instead.

/assign @vincepri
/cc @FillZpp

[k8s-ci-robot]

@alvaroaleman: GitHub didn't allow me to request PR reviews from the following users: FillZpp.

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In response to this:

Depending on the API, the SchemeBuilder might not be exported. Since we
only care about its AddToScheme, take that as argument instead.

/assign @vincepri
/cc @FillZpp

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[vincepri]

/approve
/lgtm
/milestone v0.7.x

[vincepri]

/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, vincepri

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[k8s-ci-robot]

@alvaroaleman: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-controller-runtime-apidiff-master	4e27187	link	/test pull-controller-runtime-apidiff-master

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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