Replace Go model generation for openshift-model

[manusa]

Description

Part of #6130

Replace model generation for openshift-model module with new OpenAPI approach.

[!Note] For OpenShift models there are going to be multiple conflicts with the previously generated code. The openapi-generator won't reuse some of the types since OpenShift's OpenAPI spec hasn't got shared references and model types are defined inline.

Tasks

• Remove build-helper-maven-plugin
• Remove maven-antrun-plugin from the generate profile
• Add openapi-model-generator-maven-plugin to the generate profile
• Configure the plugin to generate the specific classes
• Remove the go-related files and directories (Makefile, cmd)
• Remove invocation from the generateModel.sh script

[manusa]

We need to extract those packages that are not part of the main API to openshift-model-miscellaneous

Preserved

• apps.openshift.io (com.github.openshift.api.apps)
• authorization.openshift.io
  • com.github.openshift.api.authorization
  • io.openshift.authorization
• build.openshift.io (com.github.openshift.api.apps)
• image.openshift.io (com.github.openshift.api.apps)
• oauth.openshift.io (com.github.openshift.api.apps)
• project.openshift.io (com.github.openshift.api.apps)
• quota.openshift.io
  • com.github.openshift.api.quota
  • io.openshift.quota
• route.openshift.io (com.github.openshift.api.apps)
• security.openshift.io
  • com.github.openshift.api.security
  • io.openshift.security
• template.openshift.io (com.github.openshift.api.apps)
• user.openshift.io (com.github.openshift.api.apps)

Extracted to openshift-model-miscellaneous

• helm.openshift.io
  • From: io.openshift.api.model
  • To: io.fabric8.openshift.api.model.miscellaneous.helm
• network.openshift.io
  • From: ``
  • To: io.fabric8.openshift.api.model.miscellaneous.network.cloud