[FEAT]: Support managing enterprise Actions runner groups

[palloberg]

Describe the need

I would like to be able to manage Actions runner groups for my Enterprise, using the resources created in #1477

resource "github_enterprise_organization" "example" {
  enterprise_id = data.github_enterprise.example.id
  name = "example-org"
}

resource "github_enterprise_actions_runner_group" "example" {
  name                       = "Example runners"
  visibility                 = "all"
  allows_public_repositories = true
  selected_organization_ids  = [github_enterprise_organization.example.id]
}

API reference: https://docs.github.com/en/enterprise-cloud@latest/rest/actions/self-hosted-runner-groups?apiVersion=2022-11-28#create-a-self-hosted-runner-group-for-an-enterprise

SDK Version

No response

API Version

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Relevant log output

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Code of Conduct

• I agree to follow this project's Code of Conduct