Fix unregistered celery task (#21305)

openedx.core.djangoapps.ccxcon.tasks.update_ccxcon is not get auto
discovered by celery. Adding it to CELERY_IMPORTS to be explicitly
added.

PROD-283

cms/envs/common.py

@@ -1067,7 +1067,8 @@ WEBPACK_CONFIG_PATH = 'webpack.prod.config.js'
 # Auto discover tasks fails to detect contentstore tasks
 CELERY_IMPORTS = (
     'cms.djangoapps.contentstore.tasks',
-    'openedx.core.djangoapps.bookmarks.tasks'
+    'openedx.core.djangoapps.bookmarks.tasks',
+    'openedx.core.djangoapps.ccxcon.tasks',
 )
 
 # Message configuration

openedx/core/djangoapps/ccxcon/tasks.py

@@ -14,7 +14,7 @@ from openedx.core.djangoapps.ccxcon import api
 log = get_task_logger(__name__)
 
 
-@task()
+@task(name='openedx.core.djangoapps.ccxcon.tasks.update_ccxcon')
 def update_ccxcon(course_id, cur_retry=0):
     """
     Pass through function to update course information on CCXCon.