Feature/open producten price

[Floris272]

Closes #...

Changes

• Management command to import product types and their current price options from Open Producten (PoC)
• Celery task that calls the command.
• ProductPrice form component that will be replaced by a radio component to show the price option based on the product set on the form.

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • Checked copying a form
  • Checked import/export of a form
  • Config checks in the configuration overview admin page
  • Problem detection in the admin email digest is handled

• Release management

  • I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • Ran ./bin/makemessages_js.sh
  • Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • Commit messages refer to the relevant Github issue
  • Commit messages explain the "why" of change, not the how

[codecov]

Codecov Report

Attention: Patch coverage is 97.19626% with 6 lines in your changes missing coverage. Please review.

Project coverage is 96.56%. Comparing base (4486396) to head (709a1d6).
Report is 84 commits behind head on master.

Files with missing lines	Patch %	Lines
src/openforms/contrib/open_producten/tasks.py	58.33%	5 Missing ⚠️
...c/openforms/contrib/open_producten/price_import.py	97.05%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #4790    +/-   ##
========================================
  Coverage   96.55%   96.56%            
========================================
  Files         748      756     +8     
  Lines       25399    25611   +212     
  Branches     3354     3387    +33     
========================================
+ Hits        24525    24731   +206     
- Misses        609      614     +5     
- Partials      265      266     +1     

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[sergei-maertens]

Didn't get to reviewing yet, I'll try to get it done on Monday!

[joeribekker]

Discussed in refinement: We definitely like the general setup of retrieving prices from the product API. Unfortunately, there is now also another product API (Roxit) which differs (ofcourse) and meanwhile we also introduced prices from variables in OF.

So, we really need to take a new approach on this. Closing the Pull Request since we're not merging as is but we will definitely do something similar. You did some valuable work here!