Fix mixed row inference for CTE (WITH ...) queries

[vaielab]

Fix row inference for queries starting with WITH [RECURSIVE].

The issue caused iterated rows to be inferred as mixed instead of the expected typed array shape, because getQueryType() did not recognise CTE queries as SELECT-equivalent and bailed out before reaching the reflector.

Changes:

• add regression coverage for the CTE path (simple, multi, recursive, aggregation, SELECT *, FETCH_NUM)
• update QueryReflection::getQueryType() to skip past CTE definitions and return the inner statement keyword

Result:
foreach ($stmt as $row) now keeps the expected inferred array type for WITH cte AS (...) SELECT ... FROM cte queries.