0.20.0 [monochart] Update `envFrom`

what

• Update envFrom section in _helpers.tpl

why

• envFrom is a list of EnvFromSource and there could be only one envFrom in a Container spec (possibly with many configMapRef and secretRef parameters)
• The current implementation creates two envFrom sections, which is not correct behavior and will fail if we use these two configs at the same time:

envFrom:
  secrets:
    - secret-1
  configMaps:
    - config-1

and

secrets:
  default:
    enabled: true
    mountPath: /secret-default
    annotations:
      test.secret.annotation: value
    labels:
      test_label: value
    env:
      SECRET_ENV_NAME: ENV_VALUE
    files:
      secret.test.txt: |-
        some text

• This update puts all configMapRef and secretRef parameters into just one envFrom section