robustness: fix mixed-version robustness test failing

[henrybear327]

In areEntriesEqual, the data is compared strictly. But due to the protobuf library update, v3.6 write the default value to the data, but v3.7 doesn't, causing the comparison to fail.

Ref: #21908

[k8s-ci-robot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.79%. Comparing base (eb8b216) to head (7e58172).

Additional details and impacted files

see 32 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21923      +/-   ##
==========================================
+ Coverage   69.64%   69.79%   +0.15%     
==========================================
  Files         449      449              
  Lines       38208    38208              
==========================================
+ Hits        26610    26669      +59     
+ Misses      10172    10117      -55     
+ Partials     1426     1422       -4     

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[henrybear327]

/retest

[k8s-ci-robot]

@henrybear327: The following tests 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	7e58172	link	true	/test pull-etcd-robustness-amd64
pull-etcd-e2e-amd64	7e58172	link	true	/test pull-etcd-e2e-amd64

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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