fix: remove superfluous ref for a composed schema. Fixes #4959 #5000
      
        
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Removes the root-level $ref from a schema when it has composition keywords (oneOf, allOf, or anyOf).
Checks if schema has composition - Verifies the schema contains oneOf, allOf, or anyOf arrays
Checks if root $ref matches a composed item - Compares the root $ref value against all $ref values within the composition arrays
Removes $ref if it matches - Sets the root $ref to null only if it matches one of the composed items