[mlir][Vector] Support 0-d vectors natively in TransferOpReduceRank (#112907) Since https://github.com/llvm/llvm-project/commit/ddf2d62c7dddf1e4a9012d96819ff1ed005fbb05 , 0-d vectors are supported in VectorType. This patch removes 0-d vector handling with scalars for the TransferOpReduceRank pattern. This pattern specifically introduces tensor.extract_slice during vectorization, causing vectorization to not fold transfer_read/transfer_write slices properly. The changes in vectorization test files reflect this. There are other places where lowering patterns are still side-stepping from handling 0-d vectors properly, by turning them into scalars, but this patch only focuses on the vector.transfer_x patterns.
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