flake: Multi-Components: FederatedResourceQuota enforcement testing

[zhzhuang-zju]

What type of PR is this?
/kind flake

What this PR does / why we need it:
https://github.com/karmada-io/karmada/actions/runs/19536609426/job/55932805279

      customresourcedefinitions.apiextensions.k8s.io "flinkdeployments.flink.apache.org" already exists
      {
          ErrStatus: {
              TypeMeta: {Kind: "Status", APIVersion: "v1"},
              ListMeta: {
                  SelfLink: "",
                  ResourceVersion: "",
                  Continue: "",
                  RemainingItemCount: nil,
              },
              Status: "Failure",
              Message: "customresourcedefinitions.apiextensions.k8s.io \"flinkdeployments.flink.apache.org\" already exists",
              Reason: "AlreadyExists",
              Details: {
                  Name: "flinkdeployments.flink.apache.org",
                  Group: "apiextensions.k8s.io",
                  Kind: "customresourcedefinitions",
                  UID: "",
                  Causes: nil,
                  RetryAfterSeconds: 0,
              },
              Code: 409,
          },
      }

The test suite "[ScheduleMultiTemplate] schedule multi template resource" also creates and deletes the FlinkDeployment CRD, so running two suites in parallel will interfere with each other.

Which issue(s) this PR fixes:

Part of #6814

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 resolves a recurring test flake by modifying an end-to-end test suite to run serially. The flake was caused by parallel test execution leading to AlreadyExists errors when multiple tests attempted to create or delete the same FlinkDeployment Custom Resource Definition. By enforcing serial execution for this specific suite, the change enhances the stability and reliability of the test environment.

Highlights

• Test Flake Resolution: Addressed a test flake occurring in the 'Multi-Components: FederatedResourceQuota enforcement testing' suite by ensuring it runs serially. This prevents conflicts with other parallel tests that manage the FlinkDeployment Custom Resource Definition (CRD).
• Test Execution Strategy: Changed the ginkgo.Describe block to framework.SerialDescribe for the affected test suite, explicitly marking it for serial execution to avoid race conditions related to CRD creation and deletion.

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[gemini-code-assist]

Code Review

This pull request addresses a flaky test issue by serializing a test suite that was conflicting with another due to concurrent creation and deletion of a FlinkDeployment CRD. The change correctly replaces ginkgo.Describe with framework.SerialDescribe to ensure the test runs serially, which is an effective way to resolve this kind of resource contention in parallel tests. A clear comment has been added to explain the necessity of this change. The fix is appropriate and well-implemented.

[XiShanYongYe-Chang]

If we plan to develop more test cases for FlinkDeployment in subsequent iterations, we could consider using ginkgo.Ordered to organize these test cases related to FlinkDeployment; or we could consider installing the FlinkDeployment CRD in BeforeSuite so that these test cases can run in parallel.

/lgtm

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.46%. Comparing base (6a6fb11) to head (db83754).
⚠️ Report is 2 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6941      +/-   ##
==========================================
+ Coverage   46.45%   46.46%   +0.01%     
==========================================
  Files         698      698              
  Lines       47808    47809       +1     
==========================================
+ Hits        22207    22213       +6     
+ Misses      23931    23927       -4     
+ Partials     1670     1669       -1     

Flag	Coverage Δ
unittests	46.46% <ø> (+0.01%)	⬆️

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[RainbowMango]

/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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• test/OWNERS [RainbowMango]

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