Draft: Enable Loki as a replacement for Elasticsearch when `enable_loki` is set.

Note, it is not possible to have both Loki and Elasticsearch enabled, so enable_elasticsearch must be disabled, when enable_loki is enabled.

roles/log-collector/templates/rsyslog-collector.conf.j2

@@ -227,7 +227,7 @@ ruleset(name="incoming"){
   action(type="omfile" DynaFile="TmplFile")
 {% endif %}
 
-{% if not enable_elasticsearch and enable_loki %}
+{% if enable_loki %}
 # We shouldn't send loki logs to loki
 if ($programname == "loki") then {
   stop