Adjust ingress-controller expressions
Adjust ingress-controller expressions

**Problem:**
- Wrong use of Histogram type indicator
- Cannot recognize different hosts from ingress-controller-connections graph

**Solution:**
- Use `histogram_quantile` to wrap `*_bucket` metrics
- Enhance `legendFormat` and use `ceil` to wrap `increase`

**Issue:**
https://github.com/rancher/rancher/issues/18962

rancher/rancher,rancher/rancher,rancher/rancher,rancherio/rancher,rancherio/rancher,rancher/rancher,cjellick/rancher,cjellick/rancher,cjellick/rancher