[Robustness test] Implement RunWatchLoop for kubernetes traffic (part 3)

[henrybear327]

Implement RunWatchLoop in Kubernetes traffic.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.50%. Comparing base (a438759) to head (14a04c4).
⚠️ Report is 9 commits behind head on main.

⚠️ Current head 14a04c4 differs from pull request most recent head dd8fd43

Please upload reports for the commit dd8fd43 to get more accurate results.

Additional details and impacted files

see 24 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21076      +/-   ##
==========================================
+ Coverage   68.44%   68.50%   +0.05%     
==========================================
  Files         429      429              
  Lines       35281    35281              
==========================================
+ Hits        24149    24168      +19     
+ Misses       9732     9712      -20     
- Partials     1400     1401       +1     

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[k8s-ci-robot]

@henrybear327: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-robustness-amd64	dd8fd43	link	true	/test pull-etcd-robustness-amd64

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