[mlir] Improve dialect conversion failure diagnostics (#182729) This PR improves MLIR dialect conversion failure diagnostics when legalization fails. Previously, the diagnostic mostly included the operation name (and in partial conversion, whether it was explicitly marked illegal). This change keeps that prefix and appends the printed failing operation. This provides immediate operand/result/type context directly in the same error line. ### Example Before: ``` failed to legalize operation 'test.type_consumer' that was explicitly marked illegal ``` After: ``` failed to legalize operation 'test.type_consumer' that was explicitly marked illegal: "test.type_consumer"(%arg0) : (f32) -> () ``` ### Tests - Updated `mlir/test/Transforms/test-legalizer.mlir` expectations for the richer emitted diagnostic.
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