[mlir][xegpu] Fix crash on 0D vector in vector-to-xegpu transfer lowering (#205812) `transferPreconditions` accepted rank-0 vectors, which then reached `computeOffsets` and indexed an empty `SmallVector` (`broadcasted[0]`), asserting `idx < size()` and crashing. For example: ```mlir vector.transfer_write %arg0, %arg1[%1] : vector<f32>, memref<3xf32> ``` This is valid IR (the verifier accepts it; 0D vector transfers are part of the vector dialect spec), so the conversion pass should not crash on it. Bail out via `notifyMatchFailure` for 0D vectors in the shared `transferPreconditions`, so both `transfer_read` and `transfer_write` are left unconverted instead of crashing. This matches how the core vector lowering already treats 0D transfers as an unsupported corner case (see `mlir/lib/Dialect/Vector/Transforms/LowerVectorTransfer.cpp`). Regression tests are added for 0D `transfer_read` and `transfer_write`. Fixes #205281
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