Use 'ingressClassName' instead deprecated annotation "kubernetes.io/ingress.class"

[nadiia-caspar]

Describe the solution you'd like I've noticed the warning during a chart deployment:

W0612 15:00:09.676081    1973 warnings.go:70] annotation "kubernetes.io/ingress.class" is deprecated, please use 'spec.ingressClassName' instead

The kubernetes.io/ingress.class annotation is deprecated since Kubernetes v1.18 , also a deprecation notes in AWS load balancer.

So we might add the spec.ingressClassName field to the Ingress template.