request help: namespaceSelector

[kworkbee]

Issue description

I'm running multiple APISIX Ingress Controller in the same cluster. I'm specifying namespaceSelector because resources need to be isolated at the namespace level, but it seems to be working differently in version 1.7.0 and version 1.8.0.

For example, two namespaces are each

metadata:
  name: A
  labels:
    gateway.apache.org/type: GLOBAL
    gateway.apache.org/env: DEV

metadata:
  name: B
  labels:
    gateway.apache.org/type: OPENAPI
    gateway.apache.org/env: DEV

It has a label like and it's a namepace Selector

namespaceSelector:
- gateway.apache.org/type=OPENAPI
- gateway.apache.org/env=DEV

Assuming that you have designated it as,

Version 1.7.0 of Ingress Controller reads only resources deployed in B Namespace, while version 1.8.0 of Ingress Controller reads all resources deployed in A and B Namespace.

There are no documents involved, so it is necessary to check that this is the intended action.

Environment

• your apisix-ingress-controller version (output of apisix-ingress-controller version --long): 1.7.0/1.8.0
• your Kubernetes cluster version (output of kubectl version): 1.29.6
• if you run apisix-ingress-controller in Bare-metal environment, also show your OS version (uname -a): AWS EKS

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