FIX-#7387: Limit the number of pytest workers for tests with Ray engine on Windows #16087

Job	Run time
execution-filter	5s
python-filter	1s
lint (flake8)	16s
Test API, headers and no-engine mode	1m 43s
lint (mypy)	2m 4s
test-clean-install-ubuntu	3m 9s
test-asv-benchmarks	18s
test-clean-install-windows	1m 54s
test-ubuntu (engine python, python 3.9, group_1)	20m 41s
test-ubuntu (engine unidist ${{ matrix.unidist-backend }}, python ${{ matrix.python-version }})	0s
test-windows (engine python, python 3.9, group_1)	34m 29s
Test BaseOnPython execution, Python 3.9"	16m 44s
test experimental	8m 18s
test-internals	6m 58s
test-native-dataframe-mode python ${{ matrix.python-version }})	0s
test-ubuntu-sanity (engine ray, python 3.9)	18m 34s
test-spreadsheet (engine ray, python 3.9)	1m 54s
test-ubuntu-sanity (engine dask, python 3.9)	41m 51s
test-spreadsheet (engine dask, python 3.9)	2m 2s
test-ubuntu-sanity (engine unidist, python 3.9)	16m 4s
test-windows-sanity (engine ray, python 3.9)	27m 33s
test-windows-sanity (engine dask, python 3.9)	34m 0s
test-windows-sanity (engine unidist, python 3.9)	25m 2s
merge-coverage-artifacts	2s
upload-coverage	14s
	4h 23m 56s

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