hippo-addon-channel-manager-repository artifact pulls in CMS and wicket jars

hippo-addon-channel-manager-repository has a dependency on:

<dependency>
      <groupId>org.onehippo.cms7</groupId>
      <artifactId>hippo-addon-channel-manager-content-service</artifactId>
      <version>${project.version}</version>
    </dependency>

This is bad, since hippo-addon-channel-manager-content-service pulls in a lot of wicket code, which is not ok since for platform + site deployment we pull in hippo-addon-channel-manager-repository

Instead, move the yaml config from hippo-addon-channel-manager-content-service to the repository module, and let hippo-addon-channel-manager-frontend-ng transitively pull in hippo-addon-channel-manager-content-service

Next to that, channel-content-service-module.yaml its ChannelContentServiceModule should be marked to only run in cms, thus

cmsOnly : true

Namely it fails for downstream projects in case of repository + site deployments