fix: 🔧 Update VictoriaMetrics datasource configuration

Refines the VictoriaMetrics datasource settings in Grafana by updating the name and type to ensure compatibility with the latest version.

Additionally, enables the logs datasource plugin for improved observability.

template/stacks/observability/victoria-k8s-stack/values.yaml

@@ -861,11 +861,11 @@ defaultDatasources:
   # -- Configure additional grafana datasources (passed through tpl).
   # Check [here](http://docs.grafana.org/administration/provisioning/#datasources) for details
   extra: 
-    - name: victoria-logs
+    - name: VictoriaLogs
       access: proxy
-      type: VictoriaLogs
+      type: victoriametrics-logs-datasource
       url: http://vlogs-victorialogs:9428
-      version: 1
+      version: 0.18.0
 
 # -- Grafana dependency chart configuration. For possible values refer [here](https://github.com/grafana/helm-charts/tree/main/charts/grafana#configuration)
 grafana:
@@ -900,9 +900,10 @@ grafana:
 
   # Uncomment the block below, if you want to enable VictoriaMetrics Datasource in Grafana:
   # Note that Grafana will need internet access to install the datasource plugin.
-  #
-  # plugins:
-  # - victoriametrics-metrics-datasource
+  
+  plugins:
+  - victoriametrics-metrics-datasource
+  - victoriametrics-logs-datasource
 
   ingress:
     enabled: false