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c1a22925 - [MLIR][NFC] Retire `let constructor` for passes in Conversion directory (part1) (#127403)

[MLIR][NFC] Retire `let constructor` for passes in Conversion directory (part1) (#127403) `let constructor` is deprecated since the table gen backend emits most of the glue logic to build a pass. This PR retires the td method for most (I need another pass) passes in the Conversion directory.