Fix for missing periodic task name in results

[ntindicator]

Fix for issue #376 in django-celery-results. The message broker rabbitmq isn't picking up periodic_task_name when it's passed as a keyword arg to task.apply_async(). If it's added to the headers in apply_async() it becomes available in the request object in django-celery-results. For this change to work the following commit also needs to be merged, otherwise it won't get picked up in the results.

If the task isn't triggered by django-celery-beat, but is done with code, such as using delay() or apply_async(), it will be missing, unless it's added to the headers in apply_async(). delay() doesn't support the extra options. E.g. When triggering a child task with delay() Periodic Task Name was missing in the Task Results.

These changes haven't been tested with Redis or any other message broker, only rabbitmq. CELERY_RESULT_EXTENDED was set to True in the settings.

Tested with:
celery==5.4.0
django-celery-beat==2.7.0
django-celery-results==2.5.1
Django==4.2.16
rabbitmq==4.0.2

[Nusnus]

Is it possible to add unit tests please?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.83%. Comparing base (78d3230) to head (9be2125).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #812      +/-   ##
==========================================
- Coverage   86.92%   86.83%   -0.10%     
==========================================
  Files          32       32              
  Lines         933      934       +1     
  Branches      124       74      -50     
==========================================
  Hits          811      811              
- Misses        103      105       +2     
+ Partials       19       18       -1     

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[cclauss]

Linting errors in pre-commit:

flake8...................................................................Failed
- hook id: flake8
- exit code: 1

django_celery_beat/admin.py:252:9: E303 too many blank lines (2)
django_celery_beat/admin.py:254:59: E231 missing whitespace after ':'
django_celery_beat/admin.py:257:30: E128 continuation line under-indented for visual indent
django_celery_beat/admin.py:257:59: E231 missing whitespace after ':'
t/unit/test_schedulers.py:874:5: E303 too many blank lines (2)
t/unit/test_schedulers.py:879:80: E501 line too long (81 > 79 characters)

[auvipy]

depends on celery/django-celery-results#445 (review)