Prepare release 3.1.0-alpha.0

[robinmolen]

• Resolve release blockers
  • Add metadata to data being sent to API endpoint in JSON dump registration backend #5012
  • Attachments in a repeating group are not processed in the JSON dump registration backend #5065
  • Add possiblity to quickly include all form fields in the data to be sent for the JSON dump registration backend #5066
  • Fixed metadata variables are not shown in options of JSON dump registration backend #5087
  • Metadata fieldset in JSON registration options is not visible when lots of variables are selected #5088
• Re-generate VCR cassettes (delete the old ones and then) for API tests (see instructions on
  Taiga). You can find all test cases with grep OFVCRMixin -r src
  • Accounts (openforms.accounts.tests.test_oidc)
  • Appoinments: Qmatic (openforms.appointments.contrib.qmatic) (no testenv available anymore)
  • Authentication plugins
    • DigiD (Signicat): openforms.authentication.contrib.digid.tests.test_signicat_integration
    • eHerkenning
      (Signicat):openforms.authentication.contrib.eherkenning.tests.test_signicat_integration
    • DigiD/EH via OIDC: openforms.authentication.contrib.digid_eherkenning_oidc
    • Org via OIDC: openforms.authentication.contrib.org_oidc
    • openforms.tests.test_registrator_prefill
  • General purpose clients
    • openforms.contrib.brk
    • openforms.contrib.haal_centraal.tests.test_integration
    • openforms.contrib.kvk
    • openforms.contrib.objects_api.tests
    • suwinet.tests.test_client (testenv access has been retracted and won't be reinstated)
  • Forms
    • openforms.forms.tests.test_import_export
    • openforms.forms.tests.e2e_tests.test_registration_backend_conf
  • Payment plugins
    • Ogone legacy: openforms.payments.contrib.ogone.tests.test_client
  • Prefill
    • Objects API: openforms.prefill.contrib.objects_api
    • Suwinet: openforms.prefill.contrib.suwinet (testenv access has been retracted and won't
      be reinstated)
  • Registration plugins:
    • Objects API: openforms.registrations.contrib.objects_api
    • ZGW APIs: openforms.registrations.contrib.zgw_apis
    • StUF_ZDS APIs: openforms.registrations.contrib.stuf_zds.tests.test_backend
• Release new SDK version
• Correct SDK version pinned in .sdk-release
• Check translations
  • SDK
  • Backend
  • Frontend
  • Formio
• Bump API version number
  • Version bump
  • Regenerate API spec
  • Update READMEs with release dates + links
• Update the upgrade_simulation CI job matrix
• Bump version number (including package-lock.json)
• Update changelog