Tests

Also test branch mutants, for pushes to branches #1761

Job	Run time
quick-test	2m 30s
tests-from-tarball (ubuntu-latest)	2m 14s
branch-mutants (cargo)	15s
cargo-mutants (0, cargo)	6m 13s
test (macOS-latest, stable)	4m 56s
branch-mutants (nextest)	16s
pr-mutants	0s
test (macOS-latest, nightly)	6m 52s
cargo-mutants (1, cargo)	7m 26s
test (macOS-latest, 1.78)	5m 9s
cargo-mutants (2, cargo)	7m 4s
test (ubuntu-latest, stable)	4m 46s
cargo-mutants (3, cargo)	10m 4s
test (ubuntu-latest, nightly)	5m 8s
cargo-mutants (4, cargo)	9m 3s
test (ubuntu-latest, 1.78)	4m 44s
cargo-mutants (5, cargo)	10m 40s
cargo-mutants (6, cargo)	8m 2s
test (windows-latest, stable)	8m 45s
test (windows-latest, nightly)	10m 32s
cargo-mutants (7, cargo)	11m 18s
test (windows-latest, 1.78)	8m 13s
cargo-mutants (8, cargo)	9m 44s
cargo-mutants (9, cargo)	6m 54s
	2h 30m 48s

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