GN-5239: headless-editor - add necessary RDFa plugins

[elpoelma]

Overview

While moving to the seperate agendapoint service, I forgot to configure the necessary RDFa plugins for the headless editor (this are plugins that are configured by default on a headful editor).

connected issues and PRs:

GN-5239

How to test/reproduce

• Start the app
• Login as a municipality/OCMW
• Open/create an IV
• Ensure at least one of the following mandatee tables is configured
  • IVGR3-LMB-1-eedafleggingen
  • IVGR7-LMB-2-ontvankelijkheid-schepenen
  • IVRMW2-LBM-3-verkiezing-leden
• Sync the meeting
• Open the AP containing one of the 3 tables
• Ensure the RDFa is correct (the mandatees should be connected to the decision using the mandaat:bekrachtigtAanstellingVan predicate)

Checks PR readiness

• UI: works on smaller screen sizes
• UI: feedback for any loading/error states
• Check cancel/go-back flows
• Check database state correct when deleting/updating (especially regarding relationships)
• changelog
• npm lint
• no new deprecations