`helm_resource` doesn't support `--version`

[nhomble]

I was trying to pin my remote helm chart to a specific version, but I could not find a parameter to set this value. To get around this, I had to fallback to helm_remote which has an explicit version field.

[nicks]

helm_resource has a flags arg, so you can pass additional flags to helm install.

https://github.com/tilt-dev/tilt-extensions/tree/master/helm_resource#helm_resource