…unner group types

Add NetworkConfigurationID and HostedRunnersURL fields to EnterpriseRunnerGroup,
and NetworkConfigurationID to CreateEnterpriseRunnerGroupRequest and
UpdateEnterpriseRunnerGroupRequest to match the GitHub API response schema.

These fields already exist on the organization-scoped RunnerGroup type but were
missing from the enterprise equivalents. The GitHub API returns both fields on
enterprise runner group endpoints (List, Get, Create, Update).

Fixes: integrations/terraform-provider-github#3274

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gmlewis changed the title Add NetworkConfigurationID and HostedRunnersURL to enterprise runner group types feat: Add NetworkConfigurationID and HostedRunnersURL to enterprise runner group types