Add kgw 1.4 conformance report (#4202)

Signed-off-by: timflannagan <timflannagan@gmail.com>

Author: timflannagan

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

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+# kgateway
+
+## Table of contents
+
+| API channel  | Implementation version                                                        | Mode    | Report                                                    |
+|--------------|-------------------------------------------------------------------------------|---------|-----------------------------------------------------------|
+| experimental | [v2.1.0](https://github.com/kgateway-dev/kgateway/releases/tag/v2.1.0) | default | [Link](./v2.1.0-report.yaml) |
+
+## Reproduce
+
+### Steps
+
+1. Clone the kgateway repository:
+
+   ```sh
+   git clone https://github.com/kgateway-dev/kgateway.git && cd kgateway && git checkout tags/v2.1.0
+   ```
+
+2. Bootstrap a KinD cluster with all the necessary components installed:
+
+   ```sh
+   make setup-base
+   ```
+
+3. Deploy the kgateway Helm charts:
+
+   ```sh
+   export VERSION="v2.1.0"
+
+   helm upgrade -i --create-namespace --namespace kgateway-system --version $VERSION kgateway-crds oci://cr.kgateway.dev/kgateway-dev/charts/kgateway-crds
+
+   helm upgrade -i --namespace kgateway-system --version $VERSION kgateway oci://cr.kgateway.dev/kgateway-dev/charts/kgateway
+   ```
+
+4. Run the conformance tests:
+
+   ```sh
+   make conformance
+   ```
+
+5. View and verify the conformance report: `cat _test/conformance/v2.1.0-report.yaml`

conformance/reports/v1.4.0/kgateway/v2.1.0-report.yaml

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+apiVersion: gateway.networking.k8s.io/v1
+date: "2025-10-27T12:38:25-04:00"
+gatewayAPIChannel: experimental
+gatewayAPIVersion: v1.4.0
+implementation:
+  contact:
+  - github.com/kgateway-dev/kgateway/issues/new/choose
+  organization: kgateway-dev
+  project: kgateway
+  url: github.com/kgateway-dev/kgateway
+  version: v2.1.0
+kind: ConformanceReport
+mode: default
+profiles:
+- core:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 13
+      Skipped: 0
+  extended:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 1
+      Skipped: 0
+    supportedFeatures:
+    - GatewayAddressEmpty
+    unsupportedFeatures:
+    - 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: 20
+      Skipped: 0
+    supportedFeatures:
+    - GatewayAddressEmpty
+    - HTTPRouteBackendProtocolH2C
+    - HTTPRouteBackendProtocolWebSocket
+    - HTTPRouteBackendRequestHeaderModification
+    - HTTPRouteBackendTimeout
+    - HTTPRouteDestinationPortMatching
+    - HTTPRouteHostRewrite
+    - HTTPRouteMethodMatching
+    - HTTPRouteNamedRouteRule
+    - HTTPRouteParentRefPort
+    - HTTPRoutePathRedirect
+    - HTTPRoutePathRewrite
+    - HTTPRoutePortRedirect
+    - HTTPRouteQueryParamMatching
+    - HTTPRouteRequestMirror
+    - HTTPRouteRequestTimeout
+    - HTTPRouteResponseHeaderModification
+    - HTTPRouteSchemeRedirect
+    unsupportedFeatures:
+    - GatewayHTTPListenerIsolation
+    - GatewayInfrastructurePropagation
+    - GatewayPort8080
+    - GatewayStaticAddresses
+    - HTTPRouteCORS
+    - HTTPRouteRequestMultipleMirrors
+    - HTTPRouteRequestPercentageMirror
+  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:
+    - GatewayAddressEmpty
+    unsupportedFeatures:
+    - GatewayHTTPListenerIsolation
+    - GatewayInfrastructurePropagation
+    - GatewayPort8080
+    - GatewayStaticAddresses
+  name: GATEWAY-TLS
+  summary: Core tests succeeded. Extended tests succeeded.
+succeededProvisionalTests:
+- GatewayOptionalAddressValue
+- HTTPRouteNamedRule