fix ListenerSet conformance test

[zirain]

• remove prefix x from filename
• enable ListenerSet conformance test

TODO: revist ListenerSetHostnameConflict and ListenerSetProtocolConflict later

[netlify]

✅ Deploy Preview for cerulean-figolla-1f9435 canceled.

Name	Link
🔨 Latest commit	56260ee
🔍 Latest deploy log	https://app.netlify.com/projects/cerulean-figolla-1f9435/deploys/699ec52a92f1b2000893450e

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.72%. Comparing base (26fa4e6) to head (56260ee).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/gatewayapi/status/listenerset.go	71.42%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8344      +/-   ##
==========================================
- Coverage   73.73%   73.72%   -0.01%     
==========================================
  Files         241      241              
  Lines       37077    37097      +20     
==========================================
+ Hits        27337    27349      +12     
- Misses       7796     7804       +8     
  Partials     1944     1944              

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