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test: isolate repository fixtures and restore Windows reference coverage #3166

Job	Run time
install/import (macos-latest, 3.10)	5m 10s
install/import (ubuntu-24.04, 3.8)	5m 10s
install/import (windows-latest, 3.8)	5m 10s
install/import (macos-latest, 3.8)	5m 10s
install/import (ubuntu-latest, 3.10)	5m 10s
install/import (macos-latest, 3.9)	5m 10s
install/import (ubuntu-24.04, 3.9)	5m 10s
test (windows, 3.11)	5m 11s
install/import (windows-latest, 3.9)	5m 10s
install/import (windows-latest, 3.10)	5m 10s
test (windows, 3.15)	5m 11s
test (macos, 3.14)	5m 11s
test (macos, 3.15)	5m 11s
test (windows, 3.13)	5m 11s
test (ubuntu, 3.15)	5m 10s
test (ubuntu, 3.15t)	5m 10s
test (ubuntu, 3.13)	5m 10s
test (ubuntu, 3.11)	5m 10s
test (macos, 3.11)	5m 10s
test (windows, 3.14)	5m 11s
test (ubuntu, 3.14)	5m 10s
test (ubuntu, 3.14t)	5m 10s
test (macos, 3.12, gix)	5m 11s
test (windows, 3.12, gix)	5m 11s
test (macos, 3.13)	5m 11s
test (ubuntu, 3.12)	5m 10s
test (windows, 3.14t)	5m 11s
test (windows, 3.15t)	5m 11s
test (windows, 3.12)	5m 11s
test (macos, 3.12)	5m 11s
test (ubuntu, 3.12, gix)	5m 11s
	2h 40m 24s