fix ListenerSet conformance test

[zirain]

Replace #8361

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[chatgpt-codex-connector]

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Reviewed commit: 202af4ea0e

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[codecov]

Codecov Report

❌ Patch coverage is 83.52490% with 43 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.84%. Comparing base (da685e8) to head (3c5e532).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/gatewayapi/validate.go	82.60%	31 Missing and 5 partials ⚠️
internal/gatewayapi/listener.go	80.00%	2 Missing and 2 partials ⚠️
internal/gatewayapi/listenerset.go	85.71%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8910      +/-   ##
==========================================
+ Coverage   74.73%   74.84%   +0.10%     
==========================================
  Files         251      251              
  Lines       40394    40565     +171     
==========================================
+ Hits        30189    30359     +170     
+ Misses       8138     8129       -9     
- Partials     2067     2077      +10     

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[zirain]

@codex

[chatgpt-codex-connector]

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Reviewed commit: fdfcdd87e6

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