Use rewritten EntityQuery for query validation to ensure normalization

[bandalgomsu]

Since queryEnhance.rewrite() sanitizes the queryString,
the validation phase has been improved to use the rewritten queryString (= queryEnhance.rewrite()) when creating the validatingEm query.

#4034

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[mp911de]

We've gone for a simpler approach that aligns with the API design and compute the normalized query from EntityQuery. Thanks for your suggestion in any case.