fix(taskworker): Make activity task compatible with taskworker (#91292)

Also throw an exception if any task is created without a taskworker
config.

Author: evanh

src/sentry/tasks/activity.py

@@ -2,6 +2,8 @@
 
 from sentry.silo.base import SiloMode
 from sentry.tasks.base import instrumented_task
+from sentry.taskworker.config import TaskworkerConfig
+from sentry.taskworker.namespaces import notifications_tasks
 from sentry.utils.sdk import bind_organization_context
 
 logger = logging.getLogger(__name__)
@@ -26,8 +28,11 @@ def get_activity_notifiers(project):
     name="sentry.tasks.activity.send_activity_notifications",
     queue="activity.notify",
     silo_mode=SiloMode.REGION,
+    taskworker_config=TaskworkerConfig(
+        namespace=notifications_tasks,
+    ),
 )
-def send_activity_notifications(activity_id):
+def send_activity_notifications(activity_id: int) -> None:
     from sentry.models.activity import Activity
     from sentry.models.organization import Organization