test: update robustness doc and new case to reproduce 19179 #19353
+80
−25
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NOTE: It's still hard to reproduce it. It may take 5 minutes or few hours.
Closes: #19304
Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.
cc @ahrtr @serathius @siyuanfoundation