Reinstate ipyparallel downstream tests (#1426) #3627

Job	Run time
Test Lint	1m 14s
Make SDist	39s
link_check	2m 18s
build (ubuntu-latest, 3.10)	4m 40s
test_docs	50s
build (ubuntu-latest, 3.12)	4m 44s
build (ubuntu-latest, 3.11)	4m 45s
test_without_debugpy (ubuntu-latest, 3.10)	2m 30s
check_release	1m 51s
build (windows-latest, 3.10)	7m 22s
build (ubuntu-latest, pypy-3.10)	4m 59s
build (ubuntu-latest, 3.13)	4m 47s
build (windows-latest, 3.13)	8m 50s
build (macos-latest, 3.12)	5m 21s
build (macos-latest, 3.10)	5m 7s
build (windows-latest, pypy-3.10)	7m 59s
build (macos-latest, 3.11)	5m 4s
build (macos-latest, 3.13)	4m 37s
Test Prereleases	2m 34s
build (macos-latest, pypy-3.10)	5m 25s
build (windows-latest, 3.12)	8m 21s
Test Minimum Versions	2m 50s
build (windows-latest, 3.11)	7m 37s
Install from SDist and Test	2m 39s
coverage	10s
	1h 47m 13s

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