trunk/933e37182bed4de09844e675341fa72e18fb522f: [inductor] Add direct scheduler unit tests (#195336)

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Fixes #150476 Adds focused unit test coverage for previously under-tested functionality in torch/_inductor/scheduler.py . The added tests cover: FusionResult immediate and deferred fusion decisions. PendingFusion state and fusion-node bookkeeping. NodeUser identity, equality, hashing, and conservative merging behavior. Nested reduction candidate selection and fusion legality checks. Classification and rejection of p…

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