Setup branch-protection for kubernetes-client and kubernetes-incubator

[spiffxp]

Every repo already should have cla/linuxfoundation as required, but there are
a number that don't. This fixes that.

Repos that have other required status contexts have those enabled as well

ref: #6227

/hold
for comment / lazy consensus, no objections by friday 10am PT and I'll merge this

[spiffxp]

/sig contributor-experience

[cblecker]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cblecker, spiffxp

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[cblecker]

Maybe kubernetes-csi too?

[spiffxp]

kubernetes-csi is already covered, they asked earlier

now I'm voluntolding

[roachmd]

LTGM

[spiffxp]

/hold cancel

[k8s-ci-robot]

@spiffxp: Updated the config configmap using the following files:

• key config.yaml using file prow/config.yaml

In response to this:

Every repo already should have cla/linuxfoundation as required, but there are
a number that don't. This fixes that.

Repos that have other required status contexts have those enabled as well

ref: #6227

/hold
for comment / lazy consensus, no objections by friday 10am PT and I'll merge this

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