[636] Fix Chi2Test: Support residuals for 2D/3D histograms (#20798) #20844
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[hist] Chi2Test: Support residuals for 2D/3D histograms
Fixed bug where Chi2Test only stored residuals for 1D histograms. For 2D/3D histograms, the residual array indexing ignored j and k loop indices, causing incorrect storage.
Added resIndex counter for each comparison mode (UU, UW, WW) to properly index the residuals array for multi-dimensional histograms.
Fixes #20761
(cherry picked from commit 5b770f8)