chore(DO NOT MERGE): Test ThreadCount::SensibleDefault #281

Job	Run time
Build - x86_64-unknown-linux-gnu	1m 0s
Build - aarch64-unknown-linux-gnu	1m 15s
Build - aarch64-apple-darwin	1m 3s
Build - x86_64-apple-darwin	1m 22s
Build - x86_64-pc-windows-gnu	3m 52s
Test - x86_64-unknown-linux-gnu	55s
Test - aarch64-unknown-linux-gnu	1m 37s
Test - x86_64-apple-darwin	1m 4s
Test - aarch64-apple-darwin	52s
Test - x86_64-pc-windows-gnu	1m 34s
Publish	0s
	14m 34s

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