Issue #2948786 by mparker17, Brolad, vacho: Fix config schema for value_form component.

      sequence:

        type: string

    value_form:

      type: sequence

      # The value from the field type. Ideally, this would be the field's value

      # type, i.e.: field.[%parent.field_type].value, but we can't guarantee

      # that the field the user is trying to control has a properly-defined

      # schema, so we explicitly say "no data typing is possible".

      type: ignore

      label: 'Values from widget'

      sequence:

        # Since it sub-config of field.widget.third_party, get there.

        type: field.value.[%parent.%parent.%parent.%parent.%parent.%parent.type]

        label: 'Value from widget'

    effect:

      type: string

    effect_options: