Celery: remove duplication of task names (#8929)

This was used to allow new instances to execute old Celery task names since they
were moved into different modules and their name changed.

Author: humitos

readthedocs/projects/apps.py

@@ -8,10 +8,6 @@ class ProjectsConfig(AppConfig):
     name = 'readthedocs.projects'
 
     def ready(self):
-        # TODO: remove this import after the deploy together with the
-        # `tasks/__init__.py` file
-        import readthedocs.projects.tasks
-
         import readthedocs.projects.tasks.builds
         import readthedocs.projects.tasks.search
         import readthedocs.projects.tasks.utils