releng: Enable KMS API for all staging projects
releng: Enable KMS API for all staging projects

Even though staging projects may not contain their own keys, their
service accounts could still require the KMS API to be enabled to
allow decryption using the keys on other GCP projects.

One such case is the staging release projects requiring access to
decrypt keys on the 'k8s-releng-prod' GCP project.

Signed-off-by: Stephen Augustus <f96984fef9637085f0559f1484dfd4e99545cd6e@vmware.com>

kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io,thockin/k8s.io,thockin/k8s.io,thockin/k8s.io,kubernetes/k8s.io,thockin/k8s.io