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promql: fix currentSamples accounting for native histograms in matrixIterSlice

promql: fix currentSamples accounting for native histograms in matrixIterSlice: a task in rh-swe-bench (Harbor dataset). Title: promql: fix currentSamples accounting for native histograms in matrixIterSlice

The task

**Title:** promql: fix currentSamples accounting for native histograms in matrixIterSlice

Part of rounakbende/rh-swe-bench.