TestUpdateClusterEventHandler run panic: timeout

[XiShanYongYe-Chang]

Which jobs are flaking:

https://github.com/karmada-io/karmada/actions/runs/11906386867/job/33178540609

It is imported in #5810, and then we often find some occasional mistakes like this:

#5810 (comment)

Which test(s) are flaking:

karmada/pkg/search/controllers_test.go

Line 228 in 1e26af3

name: "AddAllEventHandlers_TriggerDeleteClusterEvent_DeletedClusterAddedToWorkQueue",

Reason for failure:

The ten-minute timeout is terminated by go/testing package, this indicates that our test is in a state of constant waiting.

Anything else we need to know:

[XiShanYongYe-Chang]

In favor of #5856
/assign