Migrate 100 node release-branch blocking jobs to k8s-infra-prow-build

[spiffxp]

Followup to #17725 which migrated just the master branch job

ref: kubernetes/k8s.io#841

[k8s-ci-robot]

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[spiffxp]

/cc @mm4tt
scalability oncall

[mm4tt]

/lgtm

[k8s-ci-robot]

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

• key 1.15.yaml using file config/jobs/kubernetes/sig-release/release-branch-jobs/1.15.yaml
• key 1.16.yaml using file config/jobs/kubernetes/sig-release/release-branch-jobs/1.16.yaml
• key 1.17.yaml using file config/jobs/kubernetes/sig-release/release-branch-jobs/1.17.yaml
• key 1.18.yaml using file config/jobs/kubernetes/sig-release/release-branch-jobs/1.18.yaml

In response to this:

Followup to #17725 which migrated just the master branch job

ref: kubernetes/k8s.io#841

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