Refactor all tests that acessed the embeded object

test/scheduled_activity_worker_test.exs

test/user_test.exs

test/web/activity_pub/activity_pub_test.exs

test/web/activity_pub/transmogrifier_test.exs

test/web/common_api/common_api_test.exs

test/web/mastodon_api/mastodon_api_controller_test.exs

test/web/mastodon_api/status_view_test.exs