Allow developer role to access group-level templates

What does this MR do?

This MR lowers the bar for access to group level templates when creating a new project. Previously only maintainer and above roles were able to do that. As per our documentation, group level templates should be accessible to any roles that has access to create new projects.

https://docs.gitlab.com/ee/user/group/custom_project_templates.html

https://gitlab.com/help/user/permissions#group-members-permissions

Issue: https://gitlab.com/gitlab-org/gitlab-ee/issues/12806

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Performance and Testing

N/A

Security

N/A