Test

manage-traffic-jam: add servers only option #1110

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Run time

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Job	Run time
build (3.8, ubuntu-latest)	1m 59s
build (3.8, windows-latest)	3m 11s
build (3.9, ubuntu-latest)	1m 54s
build (3.9, windows-latest)	3m 22s
build (3.10, ubuntu-latest)	1m 58s
build (3.10, windows-latest)	3m 19s
build (3.11, ubuntu-latest)	2m 1s
build (3.11, windows-latest)	4m 11s
	21m 55s