[mlir][vector] Update tests for xfer permutation lowering (4/N) (#127624) * Document the remaining test cases, add a note that these are exercising `TransferOpReduceRank` (addresses an existing TODO). * Add missing cases (for fixed-width and scalable vectors). * Remove scalable vectors from the negative test (the masked case) - this test will also fail with fixed-width vectors. For consistency, lets make all negative test use fixed-width vectors.
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