Catch migration crashes because of broken configuration

[sergei-maertens]

Closes #4247

Through manual editing or form changes without matching logic updates, the formio configuration itself may end up in a broken state, which crashes our data migration trying to process it.

Changes

• Added test case with broken formio configuration
• Added robustness to prevent migration crashes

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

All modified and coverable lines are covered by tests ✅

Project coverage is 96.14%. Comparing base (ed4156b) to head (8914f5e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4252   +/-   ##
=======================================
  Coverage   96.14%   96.14%           
=======================================
  Files         732      732           
  Lines       23496    23501    +5     
  Branches     2751     2752    +1     
=======================================
+ Hits        22591    22596    +5     
  Misses        639      639           
  Partials      266      266           

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[Viicos]

Wondering if the email digest could include this issue

[sergei-maertens]

Wondering if the email digest could include this issue

Definitely could! I added #4254