Configuration refactor

[Viicos]

Partly closes #3154

Changes

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.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 35.54502% with 136 lines in your changes are missing coverage. Please review.

Project coverage is 95.73%. Comparing base (72fabfd) to head (0aa0423).
Report is 16 commits behind head on master.

❗ Current head 0aa0423 differs from pull request most recent head f464f5b

Please upload reports for the commit f464f5b to get more accurate results.

Files	Patch %	Lines
...ms/submissions/models/submission_value_variable.py	27.35%	85 Missing ⚠️
src/openforms/formio/datastructures.py	41.37%	34 Missing ⚠️
src/openforms/formio/components/vanilla.py	53.33%	7 Missing ⚠️
src/openforms/formio/registry.py	42.85%	4 Missing ⚠️
src/openforms/forms/models/form.py	50.00%	4 Missing ⚠️
src/openforms/forms/models/form_definition.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4318      +/-   ##
==========================================
- Coverage   96.25%   95.73%   -0.52%     
==========================================
  Files         731      731              
  Lines       23718    23936     +218     
  Branches     2795     2838      +43     
==========================================
+ Hits        22829    22915      +86     
- Misses        619      752     +133     
+ Partials      270      269       -1     

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