Invert blocklist scheduler dependency to task callback

backend/app/services/blocklist_service.py

@@ -525,9 +525,9 @@ def schedule_blocklist_job(
     settings: Settings,
     http_session: aiohttp.ClientSession,
     config: ScheduleConfig,
+    run_import_callback: Callable[[Settings, aiohttp.ClientSession], Awaitable[None]],
 ) -> None:
     """Register or replace the scheduled blocklist import job."""
-    from app.tasks import blocklist_import as blocklist_import_task
 
     if scheduler.get_job(JOB_ID):
         scheduler.remove_job(JOB_ID)
@@ -555,7 +555,7 @@ def schedule_blocklist_job(
         }
 
     scheduler.add_job(
-        blocklist_import_task._run_import_with_resources,
+        run_import_callback,
         trigger=trigger_type,
         id=JOB_ID,
         kwargs=kwargs,
@@ -654,10 +654,17 @@ async def update_schedule(
     http_session: aiohttp.ClientSession,
     settings: Settings,
     config: ScheduleConfig,
+    run_import_callback: Callable[[Settings, aiohttp.ClientSession], Awaitable[None]],
 ) -> ScheduleInfo:
     """Persist a new schedule config and re-register the scheduled job."""
     await set_schedule(db, config)
-    schedule_blocklist_job(scheduler, settings, http_session, config)
+    schedule_blocklist_job(
+        scheduler,
+        settings,
+        http_session,
+        config,
+        run_import_callback,
+    )
     return await get_schedule_info(db, _get_job_next_run_at(scheduler))