[Flaky unit test] TestPreemption/preempt_newer_workloads_with_the_same_priority

[mimowo]

What happened**:

The unit test flaked on unrelated branch https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_kueue/4418/pull-kueue-test-unit-main/1895031429167845376

What you expected to happen:

No failures

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

I tried locally to repro, but couldn't after 3k attempts (both local and the branch), using:

go test ./pkg/scheduler/preemption/ -race -c 
stress ./preemption.test -test.run TestPreemption

{Failed  === RUN   TestPreemption/preempt_newer_workloads_with_the_same_priority
    preemption_test.go:1562: Issued preemptions (-want,+got):
          sets.Set[string](
        - 	{"/wl2:InClusterQueue": {}},
        + 	{"/wl3:InClusterQueue": {}},
          )
--- FAIL: TestPreemption/preempt_newer_workloads_with_the_same_priority (0.09s)
}

Still, it failed once so it may repeat. I suppose the issue might be with rounding to 1s in the LastTransitionTime field. Maybe we just need to make 2s difference.

[mimowo]

cc @mbobrovskyi