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test: isolate repository fixtures and restore Windows reference coverage #3168

Job	Run time
install/import (macos-latest, 3.10)	42s
install/import (ubuntu-24.04, 3.9)	16s
install/import (windows-latest, 3.10)	1m 8s
install/import (macos-latest, 3.9)	38s
install/import (windows-latest, 3.9)	1m 11s
install/import (ubuntu-24.04, 3.8)	15s
install/import (macos-latest, 3.8)	1m 5s
install/import (ubuntu-latest, 3.10)	12s
test (ubuntu, 3.14)	3m 32s
install/import (windows-latest, 3.8)	1m 12s
test (macos, 3.12)	11m 19s
test (ubuntu, 3.15)	3m 32s
test (windows, 3.13)	55m 28s
test (ubuntu, 3.11)	3m 51s
test (macos, 3.11)	16m 23s
test (ubuntu, 3.12)	4m 3s
test (windows, 3.14)	38m 43s
test (windows, 3.12)	43m 49s
test (ubuntu, 3.13)	4m 32s
test (ubuntu, 3.15t)	4m 51s
test (ubuntu, 3.14t)	5m 20s
test (macos, 3.14)	8m 56s
test (ubuntu, 3.12, gix)	4m 9s
test (windows, 3.12, gix)	37m 23s
test (macos, 3.12, gix)	6m 47s
test (windows, 3.11)	51m 53s
test (macos, 3.13)	17m 11s
test (windows, 3.15t)	38m 16s
test (windows, 3.14t)	38m 15s
test (macos, 3.15)	14m 59s
test (windows, 3.15)	42m 47s
	7h 42m 38s