Revert "Apply migration flag check to task manager"

This reverts commit a0910eb6de.

awx/main/scheduler/tasks.py

@@ -5,15 +5,11 @@ import logging
 # AWX
 from awx.main.scheduler import TaskManager
 from awx.main.dispatch.publish import task
-from awx.main.utils.db import migration_in_progress_check_or_relase
 
 logger = logging.getLogger('awx.main.scheduler')
 
 
 @task()
 def run_task_manager():
-    if migration_in_progress_check_or_relase():
-        logger.debug("Not running task manager because migration is in progress.")
-        return
     logger.debug("Running Tower task manager.")
     TaskManager().schedule()