Modify ABI client in AS to validate and register the desired operators. The list of the operators to be installed will be fetched by a predefined file/env var

REST API https://github.com/openshift/assisted-service/blob/27f6b176fed96a82daf2fc95ae012b8e90fccac2/swagger.yaml#L5054

Note: very likely the register method to be used for updating the cluster registered