feat: envoy extension policy listenerset attach

[kkk777-7]

What this PR does / why we need it:

follow-up #9270

Support policy attachment for ListenerSet.

This PR includes:

• Policy attachment to ListenerSet and ListenerSet sections
• Route policy attachment when a route has a ListenerSet parent

Which issue(s) this PR fixes:

Fixes #8092

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 58c9a0d6c2

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[codecov]

Codecov Report

❌ Patch coverage is 87.15596% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.37%. Comparing base (98c1be7) to head (edc5df9).

Files with missing lines	Patch %	Lines
internal/gatewayapi/envoyextensionpolicy.go	85.26%	18 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9425      +/-   ##
==========================================
+ Coverage   75.34%   75.37%   +0.02%     
==========================================
  Files         252      252              
  Lines       41477    41612     +135     
==========================================
+ Hits        31252    31365     +113     
- Misses       8113     8128      +15     
- Partials     2112     2119       +7     

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[kkk777-7]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

Reviewed commit: edc5df9311

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[zirain]

one naive question: the EEP should located in the same namespace with ListenerSet, is that right?

[zhaohuabing]

one naive question: the EEP should located in the same namespace with ListenerSet, is that right?

@zirain cross-namespace policy attachment has already been supported in #8676.

[zirain]

one naive question: the EEP should located in the same namespace with ListenerSet, is that right?

@zirain cross-namespace policy attachment has already been supported in #8676.

cc @guydc