Previously the fork button was disabled for all users if they have
exceeded their project limit. This fixes that by changing the check
to see if the user can fork to a group instead of their own namespace.

This behaviour is already possible by visiting the new fork page
directly, so this just fixes the button being disabled.

Closes #38462

Closes #38276

Use modules in common utils

See merge request gitlab-org/gitlab-ce!14074

* master: (148 commits)
  Remove gaps under nav on build page
  Replace the 'project/snippets.feature' spinach test with an rspec analog
  Use correct group members path for members flyout link
  Replace the 'project/commits/revert.feature' spinach test with an rspec analog
  Merge branch 'rs-incoming-email-domain-docs' into 'security-10-0'
  Replace the 'project/archived.feature' spinach test with an rspec analog
  Fix broken link in docs/api/wiki.md
  Fixed the new sidebars width when browser has scrollbars
  Improve 'spec/features/profiles/*' specs
  Replace the 'search.feature' spinach test with an rspec analog
  dedupe yarn packages
  add dependency approvals (all MIT license)
  update build image to latest with node 8.x, yarn 1.0.2, and chrome 61
  Ensure we use `Entities::User` for non-admin `users/:id` API requests
  Minor update to address Sean McGivern's comment.
  Add data migration
  Fix setting share_with_group_lock
  created services for keys
  Prepare Repository#merge for migration to Gitaly
  Never connect to webpack-dev-server over SSL
  ...

Nobody tell @jschatz1 :P