[#2862] Integrate OpenKlant2 service with detail views

[pi-sigma]

Taiga: https://taiga.maykinmedia.nl/project/open-inwoner/task/2862

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.08911% with 18 lines in your changes missing coverage. Please review.

Project coverage is 94.31%. Comparing base (0b700d3) to head (96fb5c0).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/open_inwoner/openklant/services.py	67.50%	13 Missing ⚠️
src/open_inwoner/accounts/views/contactmoments.py	83.33%	3 Missing ⚠️
src/open_inwoner/cms/cases/views/status.py	92.59%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1490   +/-   ##
========================================
  Coverage    94.30%   94.31%           
========================================
  Files         1067     1068    +1     
  Lines        40306    40385   +79     
========================================
+ Hits         38012    38088   +76     
- Misses        2294     2297    +3     

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[swrichards]

Looks good, big push here. Mostly small'ish comments.

[swrichards]

LGTM, just one or two nitpicks, and the outstanding issue about integrating the seen status into the service.

[alextreme]

Can be merged after rebase from Paul and final check