Add description to gitlab_group_service_account_access_token

Nicolas Boussugerequested to merge
nicolas.boussuge.fintech/terraform-provider-gitlab:service-account-token-description into main

The description was already supported by the underlying GitLab API but not exposed on the resource or its data source, unlike the other access token resources. It is create-only (no rotate/edit endpoint supports it), so changing it forces a replace.

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

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