fix: log operation validator messages

[taefi]

Description

This logs the validation error messages on server side, and enhances the client-side error log for the developers to find the relevant log in server side easier.

Fixes #2916

Type of change

• Bugfix
• Feature

Checklist

• I have read the contribution guide: https://vaadin.com/docs/latest/guide/contributing/overview/
• I have added a description following the guideline.
• The issue is created in the corresponding repository and I have referenced it.
• I have added tests to ensure my change is effective and works as intended.
• New and existing tests are passing locally with my change.
• I have performed self-review and corrected misspellings.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.79%. Comparing base (ee206a9) to head (1a2ff35).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2939   +/-   ##
=======================================
  Coverage   92.79%   92.79%           
=======================================
  Files          84       84           
  Lines        3149     3149           
  Branches      759      759           
=======================================
  Hits         2922     2922           
  Misses        175      175           
  Partials       52       52           

Flag	Coverage Δ
unittests	92.79% <100.00%> (ø)

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud