Tests

Simplify code to list files and mutants (#438) #1641

Job	Run time
tests-from-tarball (ubuntu-latest)	2m 38s
minimal-versions (macOS-latest)	3m 15s
test (macOS-latest, stable)	2m 5s
minimal-versions (ubuntu-latest)	2m 19s
maximal-versions (macOS-latest)	3m 21s
test (macOS-latest, nightly)	4m 14s
minimal-versions (windows-latest)	4m 47s
maximal-versions (ubuntu-latest)	2m 32s
test (macOS-latest, 1.74)	2m 58s
maximal-versions (windows-latest)	4m 42s
test (ubuntu-latest, stable)	2m 22s
test (ubuntu-latest, nightly)	2m 19s
install (macOS-latest, stable)	1m 9s
release-binary	25s
test (ubuntu-latest, 1.74)	2m 24s
install (macOS-latest, nightly)	3m 6s
Spell check with Typos	3s
test (windows-latest, stable)	5m 4s
install (macOS-latest, 1.74)	1m 58s
test (windows-latest, nightly)	5m 35s
install (ubuntu-latest, stable)	1m 29s
test (windows-latest, 1.74)	3m 55s
install (ubuntu-latest, nightly)	2m 30s
install (ubuntu-latest, 1.74)	1m 28s
install (windows-latest, stable)	3m 56s
install (windows-latest, nightly)	5m 10s
install (windows-latest, 1.74)	2m 41s
pr-mutants	0s
cargo-mutants (0, cargo)	7m 20s
cargo-mutants (1, cargo)	6m 25s
cargo-mutants (2, cargo)	12m 35s
cargo-mutants (3, cargo)	10m 26s
cargo-mutants (4, cargo)	11m 40s
cargo-mutants (5, cargo)	10m 35s
cargo-mutants (6, cargo)	10m 24s
cargo-mutants (7, cargo)	12m 38s
cargo-mutants (8, cargo)	9m 39s
cargo-mutants (9, cargo)	10m 45s
	3h 0m 52s

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