Rename capabilities to authentication_abilities

app/controllers/jwt_controller.rb

app/controllers/projects/git_http_client_controller.rb

app/controllers/projects/git_http_controller.rb

...ervices/auth/container_registry_authentication_service.rb

lib/api/internal.rb

lib/gitlab/auth.rb

lib/gitlab/git_access.rb

spec/lib/gitlab/auth_spec.rb

spec/lib/gitlab/git_access_spec.rb

spec/lib/gitlab/git_access_wiki_spec.rb

...es/auth/container_registry_authentication_service_spec.rb