feat: add eg v1.3 gwapi conformance report (#3795)

Signed-off-by: bitliu <[email protected]>

Author: Xunzhuo

conformance/reports/v1.3.0/envoy-gateway/README.md

@@ -0,0 +1,34 @@
+# Envoy Gateway
+
+## Table of Contents
+
+|API channel|Implementation version|Mode|Report|
+|-----------|----------------------|----|------|
+| experimental |[v1.4.0](https://github.com/envoyproxy/gateway/releases/tag/v1.4.0)| default |[link](./experimental-v1.4.0-default-report.yaml)|
+
+## Reproduce
+
+1. Clone the Envoy Gateway GitHub repository
+
+   ```bash
+   git clone https://github.com/envoyproxy/gateway.git && cd gateway
+   ```
+
+2. Check out the desired version
+
+   ```bash
+   export VERSION=v<x.y.z>
+   git checkout $VERSION
+   ```
+
+3. Run the conformance tests
+
+   ```bash
+   CONFORMANCE_REPORT_PATH=conformance-report-k8s.yaml make experimental-conformance
+   ```
+
+4. Check the produced report
+
+   ```bash
+   cat ./conformance-report-k8s.yaml
+   ```

conformance/reports/v1.3.0/envoy-gateway/experimental-v1.4.0-default-report.yaml

@@ -0,0 +1,71 @@
+apiVersion: gateway.networking.k8s.io/v1
+date: "2025-05-14T03:12:24Z"
+gatewayAPIChannel: experimental
+gatewayAPIVersion: v1.3.0
+implementation:
+  contact:
+  - https://github.com/envoyproxy/gateway/blob/main/GOVERNANCE.md
+  organization: envoyproxy
+  project: envoy-gateway
+  url: https://github.com/envoyproxy/gateway
+  version: latest
+kind: ConformanceReport
+mode: default
+profiles:
+- core:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 12
+      Skipped: 0
+  name: GATEWAY-GRPC
+  summary: Core tests succeeded.
+- core:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 33
+      Skipped: 0
+  extended:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 23
+      Skipped: 0
+    supportedFeatures:
+    - GatewayAddressEmpty
+    - GatewayHTTPListenerIsolation
+    - GatewayPort8080
+    - HTTPRouteBackendProtocolH2C
+    - HTTPRouteBackendProtocolWebSocket
+    - HTTPRouteBackendRequestHeaderModification
+    - HTTPRouteBackendTimeout
+    - HTTPRouteDestinationPortMatching
+    - HTTPRouteHostRewrite
+    - HTTPRouteMethodMatching
+    - HTTPRouteParentRefPort
+    - HTTPRoutePathRedirect
+    - HTTPRoutePathRewrite
+    - HTTPRoutePortRedirect
+    - HTTPRouteQueryParamMatching
+    - HTTPRouteRequestMirror
+    - HTTPRouteRequestMultipleMirrors
+    - HTTPRouteRequestPercentageMirror
+    - HTTPRouteRequestTimeout
+    - HTTPRouteResponseHeaderModification
+    - HTTPRouteSchemeRedirect
+    unsupportedFeatures:
+    - GatewayInfrastructurePropagation
+    - GatewayStaticAddresses
+  name: GATEWAY-HTTP
+  summary: Core tests succeeded. Extended tests succeeded.
+- core:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 11
+      Skipped: 0
+  name: GATEWAY-TLS
+  summary: Core tests succeeded.
+succeededProvisionalTests:
+- HTTPRouteRequestPercentageMirror