[mlir][xegpu] Create a test pass for subgroup distribution. (#161592) Current subgroup distribution test employ the entire `xegpu-subgroup-distribute` pass which include multiple steps like layout propagation, move func body into warp op, and distribute to work items. This makes it harder to isolate the testing for xegpu subgroup distribution logic, because certain corner cases may be not supported yet by other steps mentioned above. This PR introduces a test pass for subgroup distribution logic and isolate the testing for distribution logic. We plan to add more corner case (that were not possible before) covering non-xegpu ops (like vector) in next PRs. This PR also include, 1. minor bug fixes in gather/scatter distribution. 2. bug fix in vector multi reduction lowering where it fails to retain some layouts.
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