Enable HTTP Mirror conformance tests

[salonichf5]

Proposed changes

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following format:

Enables HTTP Mirror conformance tests.

Testing: Ran conformance tests manually

CONFORMANCE PROFILE
apiVersion: gateway.networking.k8s.io/v1
date: "2025-05-28T19:24:08Z"
gatewayAPIChannel: experimental
gatewayAPIVersion: v1.3.0
implementation:
  contact:
  - https://github.com/nginx/nginx-gateway-fabric/discussions/new/choose
  organization: nginx
  project: nginx-gateway-fabric
  url: https://github.com/nginx/nginx-gateway-fabric
  version: edge
kind: ConformanceReport
mode: default
profiles:
- core:
    result: success
    statistics:
      Failed: 0
      Passed: 12
      Skipped: 0
  extended:
    result: success
    statistics:
      Failed: 0
      Passed: 1
      Skipped: 0
    supportedFeatures:
    - GatewayHTTPListenerIsolation
    - GatewayInfrastructurePropagation
    - GatewayPort8080
    unsupportedFeatures:
    - GatewayAddressEmpty
    - GatewayStaticAddresses
  name: GATEWAY-GRPC
  summary: Core tests succeeded. Extended tests succeeded.
- core:
    result: success
    statistics:
      Failed: 0
      Passed: 33
      Skipped: 0
  extended:
    result: success
    statistics:
      Failed: 0
      Passed: 14
      Skipped: 0
    supportedFeatures:
    - GatewayHTTPListenerIsolation
    - GatewayInfrastructurePropagation
    - GatewayPort8080
    - HTTPRouteHostRewrite
    - HTTPRouteMethodMatching
    - HTTPRoutePathRedirect
    - HTTPRoutePathRewrite
    - HTTPRoutePortRedirect
    - HTTPRouteQueryParamMatching
    - HTTPRouteRequestMirror
    - HTTPRouteRequestMultipleMirrors
    - HTTPRouteResponseHeaderModification
    - HTTPRouteSchemeRedirect
    unsupportedFeatures:
    - GatewayAddressEmpty
    - GatewayStaticAddresses
    - HTTPRouteBackendProtocolH2C
    - HTTPRouteBackendProtocolWebSocket
    - HTTPRouteBackendRequestHeaderModification
    - HTTPRouteBackendTimeout
    - HTTPRouteDestinationPortMatching
    - HTTPRouteParentRefPort
    - HTTPRouteRequestPercentageMirror
    - HTTPRouteRequestTimeout
  name: GATEWAY-HTTP
  summary: Core tests succeeded. Extended tests succeeded.
- core:
    result: success
    statistics:
      Failed: 0
      Passed: 11
      Skipped: 0
  extended:
    result: success
    statistics:
      Failed: 0
      Passed: 1
      Skipped: 0
    supportedFeatures:
    - GatewayHTTPListenerIsolation
    - GatewayInfrastructurePropagation
    - GatewayPort8080
    unsupportedFeatures:
    - GatewayAddressEmpty
    - GatewayStaticAddresses
  name: GATEWAY-TLS
  summary: Core tests succeeded. Extended tests succeeded.
succeededProvisionalTests:
- GatewayInfrastructure

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Closes #3350

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

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please add a brief note that summarizes the change.

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.82%. Comparing base (73c2f8c) to head (f6d3fc8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3411      +/-   ##
==========================================
+ Coverage   86.78%   86.82%   +0.03%     
==========================================
  Files         127      127              
  Lines       15020    15020              
  Branches       62       62              
==========================================
+ Hits        13035    13041       +6     
+ Misses       1834     1830       -4     
+ Partials      151      149       -2     

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