Fix 500 error when visit group from admin area if group name contains dot

What does this MR do?

Restrict admin/groups routing format

Are there points in the code the reviewer needs to double check?

no

Why was this MR needed?

Fix 500 error when visit group from admin area if group name contains dot

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/1462