Backport PR #43403: Revert Cythonized Kendall implementation and improve test case to prevent regressions#43431

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lithomas1 merged 1 commit intopandas-dev:1.3.xfrom

zrait:backporting

Sep 6, 2021

Commits on Sep 6, 2021

Backport PR #43403: Revert Cythonized Kendall implementation and improve test case to prevent regressions
zrait
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