CE upstream: Thursday

• both modified: Gemfile
• both modified: app/controllers/concerns/issuable_collections.rb
• both modified: app/finders/issuable_finder.rb
• both modified: app/models/hooks/project_hook.rb
• deleted by them: app/services/test_hook_service.rb
• both modified: app/services/wiki_pages/base_service.rb
• both modified: spec/models/ci/build_spec.rb
• deleted by them: spec/services/test_hook_service_spec.rb