Currently in the offical guide, the same polling operation is shared by all lro operations, which could cause problems for some emitters since the lro metadata contains value which doesn't fit for lro delete. See Azure/autorest.csharp#4827
This commit will create a separate polling operation which fits lro delete. The same definition is already available in https://github.com/Azure/typespec-azure/blob/955fc9534c2f7153d45c9fbe5743baa0c104d803/packages/samples/specs/data-plane/trait-versioning/main.tsp#L72-L77