Return 422 on validation error

[tvdeyen]

What is this pull request for?

Instead of returning 200 (ok) we should return 422 (Unprocessable Content) and display the error messages.

Checklist

• [x] I have followed Pull Request guidelines
• [x] I have added a detailed description into each commit message
• [x] I have added tests to cover this change

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.99%. Comparing base (8114970) to head (30ef25f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2869 +/- ## ========================================== + Coverage 95.96% 95.99% +0.03% ========================================== Files 232 232 Lines 6271 6271 ========================================== + Hits 6018 6020 +2 + Misses 253 251 -2 ```

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[sascha-karnatz]

Nice