Boxes + horizontal flow makes for more readable call graphs #2120

Job	Run time
tests (ubuntu-latest, unit, 3.8)	1m 1s
tests (ubuntu-latest, unit, 3.12)	53s
tests (ubuntu-latest, integration, 3.8)	3m 13s
tests (ubuntu-latest, integration, 3.12)	3m 12s
tests (ubuntu-latest, tool, 3.8)	57s
tests (ubuntu-latest, tool, 3.12)	50s
tests (windows-2022, unit, 3.8)	1m 53s
tests (windows-2022, unit, 3.12)	2m 0s
tests (windows-2022, integration, 3.8)	3m 35s
tests (windows-2022, integration, 3.12)	3m 18s
tests (windows-2022, tool, 3.8)	2m 41s
tests (windows-2022, tool, 3.12)	3m 20s
coverage	14s
	27m 7s

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