feat: use "path" as an error message source

[250MHz]

Description

• Use "path" as the "source" property for an error message if the key is a path parameter

Closes

Closes #3919

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.36%. Comparing base (1f8acc7) to head (9ba70d9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3920   +/-   ##
=======================================
  Coverage   98.36%   98.36%           
=======================================
  Files         346      346           
  Lines       15687    15689    +2     
  Branches     1736     1737    +1     
=======================================
+ Hits        15430    15432    +2     
  Misses        122      122           
  Partials      135      135           

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[github-actions]

Documentation preview will be available shortly at https://litestar-org.github.io/litestar-docs-preview/3920

[provinzkraut]

Thanks @250MHz!