[mlir][TilingInterface] Update `PartialReductionOpInterface` to get it more in line with `TilingInterface`. (#95460) The `TilingInterface` methods have return values that allow the interface implementation to return multiple operations, and also return tiled values explicitly. This is to avoid the assumption that the interface needs to return a single operation and this operations result are the expected tiled values. Make the `PartialReductionOpInterface::tileToPartialReduction` return `TilingResult` as well for the same reason. Similarly make the `PartialReductionOpInterface::mergeReductions` also return a list of generated operations and values to use as replacements. This is just a refactoring to allow for deprecation of `linalg::tileReductionUsingForall` with `scf::tileReductionUsingSCF` method.
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