image pushing: k8s-staging-csi -> k8s-staging-sig-storage

[pohly]

As discussed in kubernetes/k8s.io#943, we want
to consolidate all SIG-Storage related work under the new
k8s-staging-sig-storage, including the former k8s-staging-csi.

/cc @msau42

[msau42]

/lgtm
/approve

[msau42]

/assign @spiffxp

[spiffxp]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msau42, pohly, spiffxp

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[k8s-ci-robot]

@pohly: Updated the job-config configmap in namespace default at cluster default using the following files:

• key k8s-staging-csi.yaml using file ``
• key k8s-staging-sig-storage.yaml using file config/jobs/image-pushing/k8s-staging-sig-storage.yaml

In response to this:

As discussed in kubernetes/k8s.io#943, we want
to consolidate all SIG-Storage related work under the new
k8s-staging-sig-storage, including the former k8s-staging-csi.

/cc @msau42

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