SERVER-72307 Add lowering unittest for FilterNode

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SERVER-72308 Add lowering unittest for EvaluationNode

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SERVER-72309 Add lowering unittest for HashJoinNode

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SERVER-72310 Add lowering unittest for MergeJoinNode

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SERVER-72311 Add lowering unittest for SortedMergeNode

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SERVER-72312 Add lowering unittest for NestedLoopJoinNode

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SERVER-72313 Add lowering unittest for UnionNode

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SERVER-72314 Add lowering unittest for GroupByNode

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SERVER-72315 Add lowering unittest for UnwindNode

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SERVER-72316 Add lowering unittest for UniqueNode

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SERVER-72317 Add lowering unittest for SpoolProducerNode and SpoolConsumerNode

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SERVER-72318 Add lowering unittest for SpoolConsumerNode

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SERVER-72319 Add lowering unittest for CollationNode

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SERVER-72320 Add lowering unittest for LimitSkipNode

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SERVER-72321 Add lowering unittest for ExchangeNode

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