Fix testing-support includes #71

Job	Run time
skip_check	4s
build (17, ubuntu-latest)	14m 23s
build (17, windows-latest)	21m 20s
build (17, macos-latest)	11m 4s
build (21, ubuntu-latest)	13m 23s
build (21, windows-latest)	19m 8s
build (21, macos-latest)	10m 39s
build (23, ubuntu-latest)	13m 58s
build (23, windows-latest)	18m 38s
build (23, macos-latest)	13m 22s
publish	1m 13s
docs	0s
invoke-third-party-workflows	0s
	2h 17m 12s

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