gitlab_*_access_token: add `planner` access level (#10679)
The Planner role was introduced in December 2024 with GitLab 17.7 [1].
Allow its use in gitlab_project_access_token and
gitlab_group_access_token.
[1]: https://about.gitlab.com/releases/2024/12/19/gitlab-17-7-released/
(cherry picked from commit 1c0eb9ddf4)
Co-authored-by: David Phillips <phillid@users.noreply.github.com>
