chore: improve the MergeEnvoyProxyConfigs test

[zirain]

No description provided.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.34%. Comparing base (25775c2) to head (79d25f1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9944      +/-   ##
==========================================
+ Coverage   81.32%   81.34%   +0.02%     
==========================================
  Files         263      264       +1     
  Lines       40867    40964      +97     
==========================================
+ Hits        33234    33323      +89     
- Misses       7633     7640       +7     
- Partials        0        1       +1     

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