Avoid `describe`-ing symbols in specs

spec/finders/notes_finder_spec.rb

spec/lib/ci/gitlab_ci_yaml_processor_spec.rb

spec/lib/gitlab/build_data_builder_spec.rb

spec/lib/gitlab/diff/file_spec.rb

spec/lib/gitlab/diff/parser_spec.rb

spec/lib/gitlab/ldap/access_spec.rb

spec/lib/gitlab/ldap/user_spec.rb

spec/models/ci/pipeline_spec.rb

spec/models/ci/variable_spec.rb

spec/models/commit_status_spec.rb

spec/models/concerns/mentionable_spec.rb

spec/models/forked_project_link_spec.rb

spec/models/generic_commit_status_spec.rb

spec/models/global_milestone_spec.rb

spec/models/group_spec.rb

spec/models/members/project_member_spec.rb

spec/models/milestone_spec.rb

spec/models/namespace_spec.rb

spec/models/project_security_spec.rb

spec/models/project_services/buildkite_service_spec.rb