(RH) branch protection needs to be turned on for the master/main branches in prow so that it requires pass of the same CI jobs

[grokspawn]

operator-registry is a good example repo for most of this, as represented in the configuration:

• https://github.com/openshift/release/tree/master/core-services/prow/02_config/operator-framework/operator-registry
• https://github.com/openshift/release/tree/master/ci-operator/config/operator-framework/operator-registry