Add prow test jobs for release

We have prow jobs with matrix of Kubernetes versions for pull requests. We need to add the same matrix for release jobs as well.

The release job needs to be triggered when we're cutting a release (this can be detected by changes to `charts` dir in the PR)

ref: https://github.com/kubernetes/test-infra/blob/master/config/jobs/kubernetes-sigs/secrets-store-csi-driver/secrets-store-csi-driver-config.yaml#L597