flaky test: application failover with purgeMode gracefully when the GracePeriodSeconds is reach out

[zhzhuang-zju]

What type of PR is this?
/kind flake

What this PR does / why we need it:
ref to #6868 (comment)

Which issue(s) this PR fixes:

Parts of #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[gemini-code-assist]

Summary of Changes

Hello @zhzhuang-zju, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to resolve a flakiness issue in an end-to-end test for application failover. The changes improve the test's stability by introducing an explicit wait mechanism to ensure that deployments are fully provisioned and ready on the designated target clusters before the test proceeds, thereby mitigating potential race conditions that could lead to intermittent failures.

Highlights

• Flaky Test Fix: Addresses a known flaky end-to-end test related to application failover with purgeMode.
• Test Robustness: Enhances the reliability of the failover test by explicitly waiting for deployments to be ready on target clusters before proceeding.
• Variable Introduction: Introduces a targetClusters variable to clearly define the clusters involved in the test's propagation policy, improving readability and maintainability.

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[gemini-code-assist]

Code Review

This pull request addresses a flaky test by introducing a wait condition to ensure the deployment is fully ready before proceeding with the test logic. The refactoring to use a targetClusters variable also improves code readability. The approach is sound and effectively enhances test stability. I've added one suggestion to further improve the robustness of the deployment readiness check by using a more comprehensive helper function that is already available in the test framework.

[XiShanYongYe-Chang]

Thanks~
/assign

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.38%. Comparing base (4b5aa6b) to head (77239f2).
⚠️ Report is 2 commits behind head on master.
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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6917   +/-   ##
=======================================
  Coverage   46.38%   46.38%           
=======================================
  Files         697      697           
  Lines       47751    47751           
=======================================
+ Hits        22149    22150    +1     
+ Misses      23933    23932    -1     
  Partials     1669     1669           

Flag	Coverage Δ
unittests	46.38% <ø> (+<0.01%)	⬆️

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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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