Add E2E conformance test for BroadcastJob uncordon handling

[GautamBytes]

Ⅰ. Describe what this PR does

This change enhances the existing BroadcastJob end‑to‑end test suite by adding a new conformance test that verifies the controller correctly recreates pods when a cordoned node is subsequently uncordoned.

• Imports types.StrategicMergePatchType for patch operations.
• Adds a KruiseDescribe/ConformanceIt block named "BroadcastJob uncordon handling".
• Creates a fake node, cordons it, launches a BroadcastJob, then uncordons and asserts the missing pod is eventually created.
• Uses exit 0 in the container command to avoid manual status‐patch races.
• Defers cleanup of both fake node and BroadcastJob resource.

Ⅱ. Does this pull request fix one issue?

fixes #1233

Ⅲ. Describe how to verify it

1. Ensure you have a Kubernetes cluster available for testing.

2. Check out this branch and run the full E2E suite:

   go test ./test/e2e/... -timeout=20m

3. Confirm that all tests, including the new BroadcastJob uncordon handling conformance test, pass successfully.

Ⅳ. Special notes for reviews

Check out this branch and run the full E2E suite:

go test ./test/e2e/... -timeout=20m

[kruise-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kruise-bot]

Welcome @GautamBytes! It looks like this is your first PR to openkruise/kruise 🎉

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.96%. Comparing base (a225598) to head (90b066a).
⚠️ Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
...troller/broadcastjob/broadcastjob_event_handler.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2090      +/-   ##
==========================================
+ Coverage   44.94%   44.96%   +0.01%     
==========================================
  Files         318      318              
  Lines       32256    32260       +4     
==========================================
+ Hits        14499    14507       +8     
+ Misses      16333    16330       -3     
+ Partials     1424     1423       -1     

Flag	Coverage Δ
unittests	44.96% <0.00%> (+0.01%)	⬆️

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[GautamBytes]

@furykerry PTAL!

[kruise-bot]

@GautamBytes: PR needs rebase.

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