[#677] Replace selectielijst procestype with selectielijstklasse

[SilviaAmAm]

Fixes #677

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.28%. Comparing base (e68b985) to head (beabffb).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/src/openarchiefbeheer/zaken/utils.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #685      +/-   ##
==========================================
+ Coverage   90.24%   90.28%   +0.04%     
==========================================
  Files         210      210              
  Lines        6210     6227      +17     
  Branches      669      669              
==========================================
+ Hits         5604     5622      +18     
+ Misses        606      605       -1     

Flag	Coverage Δ
backend	90.96% <94.11%> (-0.05%)	⬇️
jest	32.54% <ø> (+0.02%)	⬆️
storybook	85.94% <ø> (+0.17%)	⬆️

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