bevy_ecs system stepping tests are failing and are not tested in CI

[alice-i-cecile]

Bevy version

#17651

What you did

cargo test --package bevy_ecs --lib --all-features

What went wrong

failures:
    schedule::stepping::tests::clear_breakpoint
    schedule::stepping::tests::clear_schedule
    schedule::stepping::tests::clear_schedule_then_set_behavior
    schedule::stepping::tests::clear_system
    schedule::stepping::tests::continue_always_run
    schedule::stepping::tests::continue_breakpoint
    schedule::stepping::tests::continue_never_run
    schedule::stepping::tests::continue_step_continue_with_breakpoint
    schedule::stepping::tests::disabled_always_run
    schedule::stepping::tests::disabled_breakpoint
    schedule::stepping::tests::disabled_never_run
    schedule::stepping::tests::multiple_calls_per_frame_continue
    schedule::stepping::tests::multiple_calls_per_frame_step
    schedule::stepping::tests::remove_schedule
    schedule::stepping::tests::set_behavior_then_clear_schedule
    schedule::stepping::tests::step_always_run
    schedule::stepping::tests::step_breakpoint
    schedule::stepping::tests::step_never_run

test result: FAILED. 643 passed; 18 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.04s

Additional information

These don't seem to be tested in CI somehow? Bisecting the start of the failure would be nice.

We should fix these tests, and ensure that our build system is exercising these tests. @mockersf or @BD103 may have ideas on the latter.

[Nilirad]

I searched for the commit introducing the test failure using git bisect: it is #17051.