PERF-#6721: Use `keep_partitioning=True`, for `duplicated` implementation #14093

Job	Run time
execution-filter	10s
lint (black and isort)	19s
lint (flake8)	28s
lint (mypy)	2m 21s
Test API, headers and no-engine mode	3m 29s
test-internals	7m 58s
test-asv-benchmarks	31s
test-clean-install-ubuntu	1m 26s
Test BaseOnPython execution, Python 3.9	13m 36s
test-clean-install-windows	3m 49s
test-ubuntu (engine python, python 3.9, group_1)	18m 57s
Test HDK storage format, Python 3.9	21m 1s
test-windows (engine python, python 3.9, group_1)	39m 58s
test-ubuntu (engine unidist ${{ matrix.unidist-backend }}, python ${{ matrix.python-version }})	0s
test experimental	8m 55s
test (pyarrow, python 3.9)	3m 17s
test-spreadsheet (engine ray, python 3.9)	2m 57s
test-ubuntu-sanity (engine ray, python 3.9)	22m 32s
test-spreadsheet (engine dask, python 3.9)	2m 43s
test-ubuntu-sanity (engine dask, python 3.9)	50m 14s
test-ubuntu-sanity (engine unidist, python 3.9)	33m 9s
test-windows-sanity (engine ray, python 3.9)	26m 25s
test-windows-sanity (engine dask, python 3.9)	39m 39s
test-windows-sanity (engine unidist, python 3.9)	33m 23s
upload-coverage	21s
	5h 37m 38s

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