Adding Celery retry config

[a-gleeson]

TP-??? Your PR title here

Why

What

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01% ⚠️

Comparison is base (3c75451) 92.76% compared to head (120d1ff) 92.76%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1049      +/-   ##
==========================================
- Coverage   92.76%   92.76%   -0.01%     
==========================================
  Files         458      458              
  Lines       33711    33721      +10     
  Branches     2573     2573              
==========================================
+ Hits        31273    31282       +9     
  Misses       1944     1944              
- Partials      494      495       +1     

Files Changed	Coverage Δ
common/celery.py	100.00% <ø> (ø)
notifications/tasks.py	100.00% <100.00%> (ø)
publishing/tasks.py	69.74% <100.00%> (ø)
publishing/tests/test_tasks.py	99.23% <100.00%> (ø)
settings/common.py	76.79% <100.00%> (+0.91%)	⬆️

... and 3 files with indirect coverage changes

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