Remove Ponos from CE

Based on !2227 (merged)

TODO:

• Remove & update tests

arkindex/process/models.py

@@ -10,6 +10,7 @@ from django.db.models import F, Q
 from django.urls import reverse
 from django.utils import timezone
 from django.utils.functional import cached_property
+from django.utils.module_loading import cached_import
 from enumfields import Enum, EnumField
 
 import pgtrigger
@@ -390,7 +391,7 @@ class Process(IndexableModel):
         """
         Build and start a new run for this process.
         """
-        from arkindex.project.triggers import schedule_tasks
+        schedule_tasks = cached_import(*settings.SCHEDULED_TASKS_TRIGGER)
 
         process_builder = ProcessBuilder(self)
         process_builder.validate()