FEAT-#6990: Implement lazy execution for the Ray virtual partitions. #15472

Job	Run time
execution-filter	8s
Test API, headers and no-engine mode	2m 1s
lint (flake8)	15s
lint (mypy)	2m 26s
test-clean-install-ubuntu	2m 5s
test-ubuntu (engine unidist ${{ matrix.unidist-backend }}, python ${{ matrix.python-version }})	0s
test-clean-install-windows	2m 47s
test-ubuntu (engine python, python 3.9, group_1)	19m 52s
test-asv-benchmarks	25s
test-ubuntu (engine ray, python 3.9, group_1)	22m 28s
Test BaseOnPython execution, Python 3.9	16m 7s
test experimental	8m 33s
Test HDK storage format, Python 3.9	21m 25s
test-internals	6m 45s
test-ubuntu (engine ray, python 3.9, group_2)	5m 40s
test-ubuntu-sanity (engine ray, python 3.9)	17m 22s
test-ubuntu (engine ray, python 3.9, group_3)	14m 52s
test-spreadsheet (engine ray, python 3.9)	2m 35s
test-ubuntu-sanity (engine dask, python 3.9)	37m 12s
test-ubuntu (engine ray, python 3.9, group_4)	22m 48s
test-spreadsheet (engine dask, python 3.9)	2m 31s
test-windows (engine python, python 3.9, group_1)	35m 40s
test-ubuntu-sanity (engine unidist, python 3.9)	15m 23s
test-windows (engine ray, python 3.9, group_1)	27m 57s
test-windows (engine ray, python 3.9, group_2)	16m 4s
test-windows (engine ray, python 3.9, group_3)	28m 37s
test-windows (engine ray, python 3.9, group_4)	35m 38s
test-windows-sanity (engine ray, python 3.9)	25m 2s
test-windows-sanity (engine dask, python 3.9)	35m 54s
test-windows-sanity (engine unidist, python 3.9)	29m 1s
merge-coverage-artifacts	5s
upload-coverage	37s
	7h 38m 15s

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