request help: user ingressClass, modify the ingressClassof the route, and the old route does not become invalid.

[VanLiuZhi]

Issue description

I have deployed two Ingresses, and I am now using the ingressClass to publish routes to two controllers, now everything is fine.

If I change the ingressClass of route A to the same as route B, both Ingresses will have this record, which means that route A will not delete it.

route A

apiVersion: apisix.apache.org/v2
kind: ApisixRoute
metadata:
  name: apisix-dashboard-rd
  namespace: ingress-apisix
spec:
  ingressClassName: apisix-rd
  http:
    - backends:
        - serviceName: apisix-dashboard
          servicePort: 80
      match:
        hosts:
          - apisix-admin-rd.test.com
        paths:
          - /*
      name: route

route B

apiVersion: apisix.apache.org/v2
kind: ApisixRoute
metadata:
  name: apisix-dashboard
  namespace: ingress-apisix
spec:
  ingressClassName: apisix
  http:
    - backends:
        - serviceName: apisix-dashboard
          servicePort: 80
      match:
        hosts:
          - apisix-admin.test.com
        paths:
          - /*
      name: route

The general workflow;

routeA  => ingressClassName: apisix-rd
routeB  => ingressClassName: apisix
ingressA route list => [ apisix-dashboard-rd ]
ingressB route list => [ apisix-dashboard ]

change routeA：

routeA  => ingressClassName: apisix
routeB  => ingressClassName: apisix
ingressA route list => [ apisix-dashboard-rd]
ingressB route list => [ apisix-dashboard, apisix-dashboard-rd]

I suspect that there is a data synchronization issue. After adjusting the synchronization parameters:

kubernetes:
  kubeconfig: ""
  resync_interval: "60s"

I found that the route information remains unchanged after the data is updated.

Is it designed this way, or is it a bug?

Environment

• your apisix-ingress-controller version (output of apisix-ingress-controller version --long):
• your Kubernetes cluster version (output of kubectl version):
• if you run apisix-ingress-controller in Bare-metal environment, also show your OS version (uname -a):

apisix-ingress-controller version: 1.7.1
Kubernetes: 1.26.10
apisix: 3.8.0
linux: 4.18.0 x86_64