feat: change 'gitlab_group_id' and 'gitlab_project_id' variables to 'gitlab_group_ids' and 'gitlab_project_ids' allowing for multiple GitLab groups or projects configuration

feat: change 'gitlab_group_id' and 'gitlab_project_id' variables to 'gitlab_group_ids' and 'gitlab_project_ids' allowing for multiple GitLab groups or projects configuration #53