[mlir][vector] Relax constraints on shape_cast (#136587) `vector.shape_cast` was initially designed to be the union of collapse_shape and expand_shape. There was an inconsistency in the verifier that allowed any shape casts when the rank did not change, which led to a strange middle ground where you could cast from shape (4,3) to (3,4) but not from (4,3) to (2,3,2). That issue was fixed (verifier made stricter) in https://github.com/llvm/llvm-project/pull/135855, but further feedback there (and polling) suggests that vector.shape_cast should rather allow all shape casts (so more like tensor.reshape than tensor.collapse_shape/tensor.expand_shape). This PR makes this simplification by relaxing the verifier.
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