gateway-api: Skip reconciliation for non-matching controller routes

[sayboras]

This commit is to make sure that only gateways matching cilium pre-defined controller are re-queued for reconciliation.

Testing was done with the below spec, the expected behavior is no-op as the controllerName of GatewayClass of Gateway of underlying HTTPRoute is not same as pre-defined cilium controller name value (e.g. io.cilium-gateway-controller)

apiVersion: gateway.networking.k8s.io/v1beta1
kind: GatewayClass
metadata:
  name: cilium
spec:
  controllerName: io.cilium/gateway-controller-non-matching
---
apiVersion: gateway.networking.k8s.io/v1beta1
kind: Gateway
metadata:
  name: my-gateway
spec:
  gatewayClassName: cilium
  listeners:
  - protocol: HTTP
    port: 80
    name: prod-web-gw
    allowedRoutes:
      namespaces:
        from: Same
---
apiVersion: gateway.networking.k8s.io/v1beta1
kind: HTTPRoute
metadata:
  name: http-app-1
spec:
  parentRefs:
  - name: my-gateway
    namespace: default
  rules:
  - matches:
    - path:
        type: PathPrefix
        value: /details
    backendRefs:
    - name: details
      port: 9080

Status of resources

# Ignore Gateway as it's not matching controller name in cilium
$ kg gateway my-gateway -o json | jqs
{
  "conditions": [
    {
      "lastTransitionTime": "1970-01-01T00:00:00Z",
      "message": "Waiting for controller",
      "reason": "NotReconciled",
      "status": "Unknown",
      "type": "Accepted"
    }
  ]
}

# Ignore HTTP Route as it's under cilium controller
$ kg httproute http-app-1 -o json | jqs
null

```

[youngnick]

One small nit about log levels, but aside from that LGTM.

[sayboras]

/test

Job 'Cilium-PR-K8s-1.26-kernel-net-next' failed:

Click to show.

Test Name

K8sDatapathConfig High-scale IPcache Test ingress policy enforcement

Failure Output

FAIL: Expected command: kubectl exec -n kube-system cilium-fxwd5 -- bpftool map update pinned /sys/fs/bpf/tc/globals/cilium_world_cidrs4 key 0 0 0 0 0 0 0 0 value 1 

Jenkins URL: https://jenkins.cilium.io/job/Cilium-PR-K8s-1.26-kernel-net-next/85/

If it is a flake and a GitHub issue doesn't already exist to track it, comment /mlh new-flake Cilium-PR-K8s-1.26-kernel-net-next so I can create one.

Then please upload the Jenkins artifacts to that issue.

[sayboras]

/test-runtime

[sayboras]

/test-1.26-net-next

Job 'Cilium-PR-K8s-1.26-kernel-net-next' failed:

Click to show.

Test Name

K8sDatapathConfig High-scale IPcache Test ingress policy enforcement

Failure Output

FAIL: Expected command: kubectl exec -n kube-system cilium-qhvwq -- bpftool map update pinned /sys/fs/bpf/tc/globals/cilium_world_cidrs4 key 0 0 0 0 0 0 0 0 value 1 

Jenkins URL: https://jenkins.cilium.io/job/Cilium-PR-K8s-1.26-kernel-net-next/133/

If it is a flake and a GitHub issue doesn't already exist to track it, comment /mlh new-flake Cilium-PR-K8s-1.26-kernel-net-next so I can create one.

Then please upload the Jenkins artifacts to that issue.

[sayboras]

/mlh new-flake Cilium-PR-K8s-1.26-kernel-net-next

👍 created #25652

[sayboras]

Required review is in, hitting a flake for high-scale ipcache tracked in #25652. Marking this ready to merge.