Unsupported events to be triggered in group_hook
It was found that not all events can be defined through the Terraform provider for GitLab, in the `gitlab_group_hook` resource.
> [!NOTE]
> Also validated in registry.terraform.io/gitlabhq/gitlab 19.0.0
- **Milestone events:** A milestone is created, closed, reopened, or deleted.
- **Resource access token events:** An access token expires in the next 7 days.
## Implementation Guide
- Follow the `CONTRIBUTING.md` guide for setting up your local development environment.
- Clone the community fork of this project.
- In `internal/provider/resource_gitlab_group_hook.go`, add two new attributes to the schema - `milestone_events` and `resource_access_token_events`. Look at one of the other events type attributes to see where else they need to be added to the file.
- Update or add a test case to `internal/provider/resource_gitlab_group_hook_test.go` to use the two new attributes when creating and updating a resource.
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