Add support for fine-grained permissions for GitLab CI/CD job tokens

GitLab 18.3 introduces a new feature allowing fine-grained permissions for CI/CD job tokens. The current implementation creates job tokens with default permissions.

## References
GitLab 18.3 : [Fine-grained permissions for CI/CD job tokens](https://about.gitlab.com/releases/2025/08/21/gitlab-18-3-released/#fine-grained-permissions-for-cicd-job-tokens)