`randsample.m`: fix `categorical` vector support and add BISTs #346

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SergeantQuickscoper wants to merge 2 commits intognu-octave:mainfrom

SergeantQuickscoper:dt/randsample

Commits on Dec 24, 2025

randsample.m: tiny doc fix as strcat trims trailing whitespace
SergeantQuickscoper
committed
randsample.m: fix support for categorical vectors, add vector test cases, and style fixes
SergeantQuickscoper
committed