fix flake test of KarmadactlTopPod

[zhzhuang-zju]

What type of PR is this?
/kind flake
/kind failing-test

What this PR does / why we need it:
The e2e test Karmadactl top testing Karmadactl top pod which does not exist [It] Karmadactl top pod which does not exist has been intermittently failing.
See, https://github.com/karmada-io/karmada/actions/runs/12197101877/job/34026335469?pr=5772#step:6:1770

the e2e fails because the member cluster's server is not available at this time.

error: cluster(member1): the server is currently unable to handle the request (get pods.metrics.k8s.io pod-z682t)

We are unable to determine why the metrics-server in member1 cannot handle requests due to the absence of logs from the member cluster and uncertainty regarding whether this is a transient service outage. However, we can enhance the end-to-end (e2e) stability by implementing retry logic.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.08%. Comparing base (ff7dc4a) to head (35c4adf).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5933      +/-   ##
==========================================
- Coverage   48.10%   48.08%   -0.03%     
==========================================
  Files         663      663              
  Lines       54769    54769              
==========================================
- Hits        26347    26336      -11     
- Misses      26713    26721       +8     
- Partials     1709     1712       +3     

Flag	Coverage Δ
unittests	48.08% <ø> (-0.03%)	⬇️

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[XiShanYongYe-Chang]

Thanks
/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: XiShanYongYe-Chang

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