Ignore env_prefix if validation_alias is set

[hramezani]

Found this when checking #14
This was the behavior in V1 and changed by mistake in V2.
Also, I've updated the docs pr regarding this 6a29a7d

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (eb6ed32) 95.61% compared to head (dfbc683) 95.61%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   95.61%   95.61%           
=======================================
  Files           5        5           
  Lines         251      251           
  Branches       60       60           
=======================================
  Hits          240      240           
  Misses         10       10           
  Partials        1        1           

Impacted Files	Coverage Δ
pydantic_settings/sources.py	95.63% <100.00%> (ø)

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