Refactor registration & payment plugin options UX - last bits

[sergei-maertens]

No ticket, this is my fun :)

Changes

• Refactored remaining registration plugins (except for Camunda) to button + modal config form
• Refactored sole payment provider plugin (Ogone) to button + modal config form
• Dropped support for RJSF forms - we only use the schema's for enum -> choice extraction.

One more PR will probably follow at some point to get the Camunda options form working without RJSF, and then the dependency can be dropped.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 96.55%. Comparing base (19b45bd) to head (f20a7f9).
Report is 11 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4806   +/-   ##
=======================================
  Coverage   96.55%   96.55%           
=======================================
  Files         748      748           
  Lines       25413    25413           
  Branches     3358     3358           
=======================================
  Hits        24538    24538           
  Misses        610      610           
  Partials      265      265           

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