Add extraEnvFrom helm option

Currently, to add additional env to the containers, we can only rely on `extraEnvVars`, but it is tedious to list all the variables and keep them in sync with env reflection/provider configuration. It would be much easier to handle this case if there was a `extraEnvFrom` option corresponding to the kubernetes `envFrom` field.

Start by locating the Helm chart templates and values configuration that currently handle extraEnvVars, then compare them with Kubernetes' envFrom field. Done means an extraEnvFrom option is available and passes the requested environment sources through to the containers without requiring each variable to be listed individually.

Written by the indexing model from the issue text.