✨ [#2112] Retrieve open tasks on login and store in userfeed

[stevenbal]

task: https://taiga.maykinmedia.nl/project/open-inwoner/task/2112

[Bartvaderkin]

I added some notes, but also used this as a good demo case for practical testing with mock/patch.

[stevenbal]

@Bartvaderkin I made has_change_permission and has_add_permission conditional based on settings.DEBUG, to make local development a bit easier

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.10390% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 94.95%. Comparing base (d11a962) to head (3f8aead).

Files	Patch %	Lines
src/open_inwoner/openzaak/clients.py	63.63%	4 Missing ⚠️
src/open_inwoner/userfeed/admin.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #1057    +/-   ##
=========================================
  Coverage    94.94%   94.95%            
=========================================
  Files          883      886     +3     
  Lines        30950    31099   +149     
=========================================
+ Hits         29386    29530   +144     
- Misses        1564     1569     +5     

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[Bartvaderkin]

Cool, much clearer.

I put a style note about dicts because the distinction helps a lot in reading existing code.