apisix-ingress-controller probe ports should come from .Values.config.probeAddr

The port for the healthcheck probes can be configured with via .Values.config.probeAddr

It is used in [templates/configmap.yaml](https://github.com/apache/apisix-helm-chart/blob/master/charts/apisix-ingress-controller/templates/configmap.yaml):
```yaml
probe_addr: {{ .Values.config.probeAddr | default ":8081" }}
```

However in [templates/deployment.yaml](https://github.com/apache/apisix-helm-chart/blob/master/charts/apisix-ingress-controller/templates/deployment.yaml) this value is hardcoded:
```yaml
livenessProbe:
httpGet:
path: /healthz
port: 8081
initialDelaySeconds: 15
periodSeconds: 20
```
```yaml
readinessProbe:
httpGet:
path: /readyz
port: 8081
initialDelaySeconds: 5
periodSeconds: 10
```
They should use the same templating so the ports match and the probes can succeed.

Start with charts/apisix-ingress-controller/templates/configmap.yaml and templates/deployment.yaml, comparing how probeAddr is rendered and how the liveness and readiness probe ports are set. Render the chart with a custom .Values.config.probeAddr and verify both probes use the configured port while the default remains :8081.

Written by the indexing model from the issue text.