pleg from ubuntu_k8s_unit_tests failed with Groovy-5.8 GCP

[Po-Hsu Lin]

Issue found on 5.8.0-1008.8 GCP

Test failed with:
    E1017 00:47:02.128425 40869 generic.go:274] event channel is full, discard this relist() cycle event
    --- FAIL: TestEventChannelFull (0.00s)
    generic_test.go:97: Actual events differ from the expected; diff:
    [{"ID":"1234","Type":"ContainerRemoved","Data":"c1"},{"ID":"1234","Type":"ContainerDied","Data":"c2"},{"ID":"

    A: 1234","Type":"ContainerStarted","Data":"c3"},{"ID":"4567","Type":"ContainerRemoved","Data":"c1"}]

    B: 4567","Type":"ContainerRemoved","Data":"c1"},{"ID":"4567","Type":"ContainerStarted","Data":"c4"}]

    FAIL
    FAIL k8s.io/kubernetes/pkg/kubelet/pleg 0.031s