Conformance: Add Cilium conformance report for v1.4

Signed-off-by: xtine <xtineskim@gmail.com>

Author: xtineskim

conformance/reports/v1.4.0/cilium/README.md

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+# Cilium
+
+## Table of Contents
+
+| API channel  | Implementation version                    | Mode    | Report                                                 |
+|--------------|-------------------------------------------|---------|--------------------------------------------------------|
+| experimental | [main](https://github.com/cilium/cilium/) | default | [main report](./experimental-v1.19.0-pre.2-default-report.yaml) |
+
+## Reproduce
+
+Cilium conformance tests can be reproduced by follow the steps in CI `.github/workflows/conformance-gateway-api.yaml` 
+from within the [Cilium repo](https://github.com/cilium/cilium).

conformance/reports/v1.4.0/cilium/experimental-v1.19.0-pre.2-default-report.yaml

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+<Right>apiVersion: gateway.networking.k8s.io/v1
+date: "2025-11-07T14:41:20-05:00"
+gatewayAPIChannel: experimental
+gatewayAPIVersion: v1.4.0
+implementation:
+  contact:
+  - https://github.com/cilium/community/blob/main/roles/Maintainers.md
+  organization: cilium
+  project: cilium
+  url: github.com/cilium/cilium
+  version: 1.19.0-pre.2
+kind: ConformanceReport
+mode: default
+profiles:
+- core:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 13
+      Skipped: 0
+  extended:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 3
+      Skipped: 0
+    supportedFeatures:
+    - GatewayAddressEmpty
+    - GatewayHTTPListenerIsolation
+    - GatewayInfrastructurePropagation
+    - GatewayPort8080
+    - 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: 25
+      Skipped: 0
+    supportedFeatures:
+    - GatewayAddressEmpty
+    - GatewayHTTPListenerIsolation
+    - GatewayInfrastructurePropagation
+    - GatewayPort8080
+    - GatewayStaticAddresses
+    - HTTPRouteBackendProtocolH2C
+    - HTTPRouteBackendProtocolWebSocket
+    - HTTPRouteBackendRequestHeaderModification
+    - HTTPRouteBackendTimeout
+    - HTTPRouteDestinationPortMatching
+    - HTTPRouteHostRewrite
+    - HTTPRouteMethodMatching
+    - HTTPRouteNamedRouteRule
+    - HTTPRoutePathRedirect
+    - HTTPRoutePathRewrite
+    - HTTPRoutePortRedirect
+    - HTTPRouteQueryParamMatching
+    - HTTPRouteRequestMirror
+    - HTTPRouteRequestMultipleMirrors
+    - HTTPRouteRequestPercentageMirror
+    - HTTPRouteRequestTimeout
+    - HTTPRouteResponseHeaderModification
+    - HTTPRouteSchemeRedirect
+    unsupportedFeatures:
+    - HTTPRouteCORS
+    - HTTPRouteParentRefPort
+  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: 3
+      Skipped: 0
+    supportedFeatures:
+    - GatewayAddressEmpty
+    - GatewayHTTPListenerIsolation
+    - GatewayInfrastructurePropagation
+    - GatewayPort8080
+    - GatewayStaticAddresses
+  name: GATEWAY-TLS
+  summary: Core tests succeeded. Extended tests succeeded.
+- core:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 2
+      Skipped: 0
+  name: MESH-GRPC
+  summary: Core tests succeeded.
+- core:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 7
+      Skipped: 0
+  extended:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 7
+      Skipped: 0
+    supportedFeatures:
+    - MeshClusterIPMatching
+    - MeshHTTPRouteBackendRequestHeaderModification
+    - MeshHTTPRouteNamedRouteRule
+    - MeshHTTPRouteQueryParamMatching
+    - MeshHTTPRouteRedirectPath
+    - MeshHTTPRouteRedirectPort
+    - MeshHTTPRouteRewritePath
+    - MeshHTTPRouteSchemeRedirect
+    unsupportedFeatures:
+    - MeshConsumerRoute
+  name: MESH-HTTP
+  summary: Core tests succeeded. Extended tests succeeded.
+succeededProvisionalTests:
+- GRPCRouteNamedRule
+- GatewayInfrastructure
+- GatewayOptionalAddressValue
+- HTTPRouteNamedRule
+- HTTPRouteRequestPercentageMirror
+- MeshHTTPRouteNamedRule