ensure gitlab_group name matches gitlab rules

Sina Moghaddasrequested to merge
SinaMoghaddas/terraform-provider-gitlab:fix/6655-group-name-validation into main
  • add plan-time validation for gitlab_group name to match GitLab API expectations

Fixes #6655

Signed-off-by: Sina Moghaddas sina.moghaddas@gmail.com

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