Create AsyncResult with Celery app

[sergey-misuk-valor]

We get an error coming from django-celery-boost

AttributeError
'DisabledBackend' object has no attribute '_get_task_meta_for'

this error comes from the line in django-celery-boost/src/django_celery_boost/models.py

info = self.async_result._get_task_meta()

As proposed here https://stackoverflow.com/a/37408190 this can be solved by creating AsyncResult directly from Celery app instance or explicitly providing it in AsyncResult constructor call

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.31%. Comparing base (17ace38) to head (94efcd0).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop       #5   +/-   ##
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  Coverage    94.31%   94.31%           
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  Files            4        4           
  Lines          352      352           
  Branches        39       39           
========================================
  Hits           332      332           
  Misses          14       14           
  Partials         6        6           

Flag	Coverage Δ
unittests	94.31% <100.00%> (ø)

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