Add 1.18 csi pull jobs

[msau42]

1.18 CI jobs are passing: https://k8s-testgrid.appspot.com/sig-storage-csi-ci

Adding 1.18 pull jobs now.

Verified in:
kubernetes-csi/csi-driver-host-path#173
kubernetes-csi/external-provisioner#432

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msau42

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[msau42]

/assign @xing-yang @jsafrane

[jsafrane]

/lgtm

[k8s-ci-robot]

@msau42: Updated the job-config configmap in namespace default at cluster default using the following files:

• key csi-driver-host-path-config.yaml using file config/jobs/kubernetes-csi/csi-driver-host-path/csi-driver-host-path-config.yaml
• key external-attacher-config.yaml using file config/jobs/kubernetes-csi/external-attacher/external-attacher-config.yaml
• key external-provisioner-config.yaml using file config/jobs/kubernetes-csi/external-provisioner/external-provisioner-config.yaml
• key external-resizer-config.yaml using file config/jobs/kubernetes-csi/external-resizer/external-resizer-config.yaml
• key external-snapshotter-config.yaml using file config/jobs/kubernetes-csi/external-snapshotter/external-snapshotter-config.yaml
• key livenessprobe-config.yaml using file config/jobs/kubernetes-csi/livenessprobe/livenessprobe-config.yaml
• key node-driver-registrar-config.yaml using file config/jobs/kubernetes-csi/node-driver-registrar/node-driver-registrar-config.yaml

In response to this:

1.18 CI jobs are passing: https://k8s-testgrid.appspot.com/sig-storage-csi-ci

Adding 1.18 pull jobs now.

Verified in:
kubernetes-csi/csi-driver-host-path#173
kubernetes-csi/external-provisioner#432

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