Fix redis broker URL with useStandardNaming

[seelmann]

PR #31066 introduced a new option to standardize the naming of the different helm chart resources. However this didn't include the hostname used in the redis connection URL.

How to reproduce

Helm chart 1.11.0

Deploy airflow helm chart using useStandardNaming: true, redis.enabled: true, and the default CeleryExecutor. Worker pods fail as they can't connect to redis.

[sseelmann]

BTW, a possible workaround is to define a DNS cname:

# Workaround for https://github.com/apache/airflow/pull/34825, remove with next Helm Chart release
apiVersion: v1
kind: Service
metadata:
  name: my-release-redis
spec:
  type: ExternalName
  externalName: my-release-airflow-redis.my-namespace.svc.cluster.local