[#3579] Store not just successful syncs, but also failures and filters with reasons

[swrichards]

Summary

First PR of a two-parter: this PR mainly ensures all API fields that have a counterpart in our ZGW models are in fact synced (especially during updates), and also that we give more comprehensive feedback regarding the sync outcome (including dropped entities, e.g. due to filters or errors).

Issue References

• Taiga User Story: #3579
• Taiga Task: #3601

Checklist

• CHANGELOG.rst updated

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.81279% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.81%. Comparing base (9ac56d8) to head (7f68b01).

Files with missing lines	Patch %	Lines
src/open_inwoner/openzaak/zgw_imports.py	97.41%	8 Missing ⚠️
...rc/open_inwoner/openzaak/tests/test_zgw_imports.py	99.31%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2049      +/-   ##
===========================================
+ Coverage    92.65%   92.81%   +0.16%     
===========================================
  Files         1222     1221       -1     
  Lines        46832    47550     +718     
===========================================
+ Hits         43392    44135     +743     
+ Misses        3440     3415      -25     

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[pi-sigma]

Nice refactor! I think it's almost good to go, just a few small remarks.

[pi-sigma]

@swrichards The failing test passes locally for me, maybe a fluke?

[swrichards]

@swrichards The failing test passes locally for me, maybe a fluke?

I'll take a look, some kind of hidden dependency on run order I think.