🎨 Improve formio component definitions in tests

[sergei-maertens]

This is another batch of test cleanups/improvements extracted from #5912

Future parsing with msgspec will require these to be defined according to the strict type definitions, meaning that required fields must be provided/specified or else the parsing fails/crashes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.09%. Comparing base (2982098) to head (a8c2be8).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6377      +/-   ##
==========================================
- Coverage   97.09%   97.09%   -0.01%     
==========================================
  Files         870      870              
  Lines       33415    33409       -6     
  Branches     3068     3068              
==========================================
- Hits        32443    32437       -6     
  Misses        654      654              
  Partials      318      318              

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