[mlir][vector] Fix crash in vector.from_elements folding with poison values (#158528) The vector.from_elements constant folding was crashing when poison values were present in the element list. The convertIntegerAttr function was not properly handling poison attributes, leading to assertion failures in dyn_cast operations. This patch refactors convertIntegerAttr to take IntegerAttr directly, moving poison detection to the caller using explicit isa<ub::PoisonAttrInterface> checks. The function signature change provides compile-time type safety while the early poison validation in foldFromElementsToConstant prevents unsafe casting operations. The folding now gracefully aborts when poison attributes are encountered, preventing the crash while preserving correct folding for legitimate mixed-type constants (int/float). Fixes assertion: "dyn_cast on a non-existent value" when processing ub.poison values in vector.from_elements operations.
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