Tests

Add .jj to VCS exclusions list #1748

Job	Run time
quick-test	2m 34s
tests-from-tarball (ubuntu-latest)	2m 9s
test (macOS-latest, stable)	4m 48s
cargo-mutants (0, cargo)	5m 18s
test (macOS-latest, nightly)	6m 50s
pr-mutants	0s
cargo-mutants (1, cargo)	7m 33s
test (macOS-latest, 1.78)	4m 49s
test (ubuntu-latest, stable)	4m 1s
test (ubuntu-latest, nightly)	5m 2s
test (ubuntu-latest, 1.78)	4m 3s
cargo-mutants (2, cargo)	8m 21s
test (windows-latest, stable)	8m 4s
test (windows-latest, nightly)	9m 41s
cargo-mutants (3, cargo)	9m 25s
test (windows-latest, 1.78)	6m 39s
cargo-mutants (4, cargo)	12m 41s
cargo-mutants (5, cargo)	10m 55s
cargo-mutants (6, cargo)	8m 45s
cargo-mutants (7, cargo)	13m 20s
cargo-mutants (8, cargo)	12m 21s
cargo-mutants (9, cargo)	7m 57s
overall-result	1s
	2h 35m 17s

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