fix!: mark ValidationResult constructors as private (#2958) (CP: 24.6)

[vaadin-bot]

No description provided.

[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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             24.6    #2993   +/-   ##
=======================================
  Coverage        ?   92.65%           
=======================================
  Files           ?       84           
  Lines           ?     3160           
  Branches        ?      772           
=======================================
  Hits            ?     2928           
  Misses          ?      181           
  Partials        ?       51           

Flag	Coverage Δ
unittests	92.65% <ø> (?)

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