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

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign fillzpp for approval by writing /assign @fillzpp in a comment. For more information see:The Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[kruise-bot]

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.97%. Comparing base (4778e7c) to head (ca07514).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2090      +/-   ##
==========================================
- Coverage   43.98%   43.97%   -0.01%     
==========================================
  Files         316      316              
  Lines       31776    31844      +68     
==========================================
+ Hits        13976    14003      +27     
- Misses      16392    16429      +37     
- Partials     1408     1412       +4     

Flag	Coverage Δ
unittests	43.97% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.