Feature/4686 email and StUF-ZDS inline form

[robinmolen]

Closes #4686

Changes

The registration forms for Email and StUF-ZDS now use React components, instead of react-json-schema-form generated forms. This allows us to share styling and keep the styling uniform across forms. These changes also improve the user experience, by providing a simular form layout/logic as the other registration inline forms.

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 62.16216% with 14 lines in your changes missing coverage. Please review.

Project coverage is 96.56%. Comparing base (9709586) to head (6a5802b).
Report is 71 commits behind head on master.

Files with missing lines	Patch %	Lines
src/openforms/formio/migration_converters.py	17.64%	13 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4708      +/-   ##
==========================================
- Coverage   96.61%   96.56%   -0.05%     
==========================================
  Files         746      746              
  Lines       25144    25174      +30     
  Branches     3302     3310       +8     
==========================================
+ Hits        24292    24309      +17     
- Misses        589      601      +12     
- Partials      263      264       +1     

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[robinmolen]

Closed PR in favor of #4742