Fix `RSpec/EmptyExampleGroup` cop (#24735)

.rubocop_todo.yml

spec/helpers/admin/action_logs_helper_spec.rb

spec/models/account_alias_spec.rb

spec/models/account_deletion_request_spec.rb

spec/models/account_moderation_note_spec.rb

spec/models/announcement_mute_spec.rb

spec/models/announcement_reaction_spec.rb

spec/models/announcement_spec.rb

spec/models/backup_spec.rb

spec/models/conversation_mute_spec.rb

spec/models/custom_filter_keyword_spec.rb

spec/models/custom_filter_spec.rb

spec/models/device_spec.rb

spec/models/encrypted_message_spec.rb

spec/models/featured_tag_spec.rb

spec/models/follow_recommendation_suppression_spec.rb

spec/models/list_account_spec.rb

spec/models/list_spec.rb

spec/models/login_activity_spec.rb

spec/models/mute_spec.rb