Move get_name from scheduled tasks up to tasks so adhoc tasks have a name too

To manually test, we'll execute an adhoc task and confirm it's appearance in the task log:

1. Log in as admin
2. Navigate to Reports in user menu
3. Create new report
4. In editor, press Audience tab
5. Add All users audience
6. Press Schedules tab
7. Create new schedule
8. In scheduled list, press Actions > Send schedule
9. Confirm you want to set it immediately
10. Run cron (or wait for it to run)
11. Navigate to Server > Task > Task logs in site administration
12. Confirm Name column is populated with name of each task
13. Open Filters
    • Set Type is equal to: Ad hoc
    • Press Apply
14. Confirm the Send report schedule task name is displayed in report

Automated test

1. Confirm the following passes:

   $ vendor/bin/phpunit --filter core_adhoc_task_testcase