Updated QueryNormalizer to Clone Alias AST for Issue #42452 Resolution

Updated normaliser to clone the alias ast. Resolves #42452 Implementation: * Updated QueryNormalizer to clone alias ast, when its replaced. Previously just assigning the same leads to exception in LogicalExpressinsOptimizer as it would be the same parent being inserted again. * This bug is not seen with new analyser (allow_experimental_analyzer), so no changes for it. I added a test for the same. #42827 (SmitaRKulkarni).