remove similar-names bc it's slow #1669

Job	Run time
tests (ubuntu-latest, unit, 3.8)	52s
tests (ubuntu-latest, unit, 3.12)	57s
tests (ubuntu-latest, integration, 3.8)	2m 11s
tests (ubuntu-latest, integration, 3.12)	2m 53s
tests (ubuntu-latest, tool, 3.8)	1m 9s
tests (ubuntu-latest, tool, 3.12)	1m 6s
tests (windows-2022, unit, 3.8)	1m 41s
tests (windows-2022, unit, 3.12)	1m 58s
tests (windows-2022, integration, 3.8)	3m 29s
tests (windows-2022, integration, 3.12)	2m 55s
tests (windows-2022, tool, 3.8)	3m 9s
tests (windows-2022, tool, 3.12)	4m 12s
coverage	0s
	26m 32s

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