Only generate valid names for `FsPath` tests #282

Job	Run time
stylish-haskell (9.6.4, 3.10.3.0, ubuntu-latest)	3m 13s
cabal-fmt (9.6.4, 3.10.3.0, ubuntu-latest)	2m 37s
build (8.10.7, 3.10.3.0, ubuntu-latest)	2m 5s
cabal-check (9.6.4, 3.10.3.0, ubuntu-latest)	2m 20s
build (8.10.7, 3.10.3.0, windows-latest)	3m 49s
build (8.10.7, 3.10.3.0, macOS-13)	3m 9s
build (9.2.8, 3.10.3.0, ubuntu-latest)	2m 29s
build (9.2.8, 3.10.3.0, windows-latest)	4m 26s
build (9.2.8, 3.10.3.0, macOS-13)	3m 32s
build (9.4.8, 3.10.3.0, ubuntu-latest)	3m 14s
build (9.4.8, 3.10.3.0, windows-latest)	5m 21s
build (9.4.8, 3.10.3.0, macOS-13)	4m 56s
build (9.6.4, 3.10.3.0, ubuntu-latest)	3m 10s
build (9.6.4, 3.10.3.0, windows-latest)	7m 11s
build (9.6.4, 3.10.3.0, macOS-13)	5m 0s
build (9.8.2, 3.10.3.0, ubuntu-latest)	1m 21s
build (9.8.2, 3.10.3.0, windows-latest)	4m 7s
build (9.8.2, 3.10.3.0, macOS-13)	5m 23s
	1h 7m 23s

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