AAP 2.5 Installer fails with error 'Incorrect type. Expected pk value, received str.'

Issue

• When trying to run the Installer for Ansible Automation Platform 2.5, the installer fails at the following error:

  TASK [ansible.containerized_installer.automationgateway : Update automation platform gateway service clusters] ******************************************************************
  failed: [serverA.example.com] (item={'name': 'gateway', 'service_type': 'gateway'}) => {"ansible_loop_var": "item", "changed": false, "item": {"name": "gateway", "service_type": "gateway"}, "msg": "c{'service_type': ['Incorrect type. Expected pk value, received str.']}"}
  failed: [serverB.example.com] (item={'name': 'controller', 'service_type': 'controller'}) => {"ansible_loop_var": "item", "changed": false, "item": {"name": "controller", "service_type": "controller"}, "msg": "c{'service_type': ['Incorrect type. Expected pk value, received str.']}"}
  failed: [serverC.example.com] (item={'name': 'hub', 'service_type': 'hub'}) => {"ansible_loop_var": "item", "changed": false, "item": {"name": "hub", "service_type": "hub"}, "msg": "c{'service_type': ['Incorrect type. Expected pk value, received str.']}"}
  failed: [serverD.example.com] (item={'name': 'eda', 'service_type': 'eda'}) => {"ansible_loop_var": "item", "changed": false, "item": {"name": "eda", "service_type": "eda"}, "msg": "c{'service_type': ['Incorrect type. Expected pk value, received str.']}"}