[Helm] Loki 3.0 helm chart distributed mode doesn't work for ingress without gateway

[anindyameister]

Describe the bug Loki helm chart was updated recently in #12067 to add support for distributed deployment mode, however the ingress template wasn't updated, and as a result, distributed mode can only be used with gateway enabled. SSD works with either.

To Reproduce

$ helm repo add grafana https://grafana.github.io/helm-charts && helm repo update
$ curl -sLO https://raw.githubusercontent.com/grafana/loki/main/production/helm/loki/distributed-values.yaml
$ helm template --set 'deploymentMode=Distributed,gateway.enabled=false,ingress.enabled=true' --version=6.4.2 --values distributed-values.yaml grafana/loki

Expected behavior Ingress read and write paths should use appropriate service backends for distributed mode.

Environment:

• Deployment tool: helm