fix: remove download logs in templates

[bjorand]

What this PR does / why we need it:

helm template --dependency-update prints the manifest and logs on stdout making the yaml output unusable:

Saving 2 charts
Downloading datadog-operator from repo https://helm.datadoghq.com
Deleting outdated charts
---
# Source: datadog-operator/charts/datadog-operator/templates/service_account.yaml
apiVersion: v1
kind: ServiceAccount
...