chore: update existing_resource_group_name default to null#61

ocofaigh merged 1 commit intomainterraform-ibm-modules/terraform-ibm-watsonx-self-managed-ocp:mainfrom

resource_group_default_updateterraform-ibm-modules/terraform-ibm-watsonx-self-managed-ocp:resource_group_default_updateCopy head branch name to clipboard