Reinstate ipyparallel downstream tests #3508

Job	Run time
Test Prereleases	2m 32s
Make SDist	25s
Test Lint	1m 13s
test_docs	46s
test_without_debugpy (ubuntu-latest, 3.9)	2m 18s
Test Minimum Versions	2m 32s
check_release	1m 38s
build (ubuntu-latest, 3.12)	5m 58s
build (ubuntu-latest, 3.11)	5m 6s
build (ubuntu-latest, pypy-3.10)	4m 7s
build (ubuntu-latest, 3.13)	5m 20s
build (ubuntu-latest, 3.9)	5m 15s
build (windows-latest, 3.9)	5m 53s
build (ubuntu-latest, 3.10)	5m 20s
build (windows-latest, 3.13)	5m 54s
build (windows-latest, 3.11)	5m 53s
build (macos-latest, 3.11)	4m 56s
build (windows-latest, 3.10)	5m 54s
build (windows-latest, 3.12)	5m 55s
build (macos-latest, pypy-3.10)	4m 44s
build (macos-latest, 3.9)	5m 3s
build (windows-latest, pypy-3.10)	5m 59s
build (macos-latest, 3.12)	5m 24s
build (macos-latest, 3.10)	5m 0s
build (macos-latest, 3.13)	5m 6s
link_check	1m 53s
Install from SDist and Test	2m 19s
coverage	1s
	1h 52m 24s

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