GH-50778: [C++] Fix chunked level histogram accumulation - #50780
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Rationale for this change
UpdateLevelHistogramincorrectly accumulated from the beginning of the input on every iteration of itsmax_level == 1fast path. Inputs spanning multiple chunks therefore counted the first chunk repeatedly.Fix #50778.
What changes are included in this PR?
itrather thanlevels.begin().Are these changes tested?
Yes, passing the new UT and existing UT.
Are there any user-facing changes?
No.