schema: Specify alerting related config

This adds:
- alerts
- elasticsearch
- fluentd
- grafana
- grafanaLabelEnforcer
- kubeStateMetrics
- metricsServer
- opensearch
- openstackMonitoring
- prometheus
- prometheusBlackboxExporter
- prometheusNodeExporter
- prometheusOperator
- s3Exporter
- thanos
- wcProbeIngress
- welcomingDashboard

Co-authored-by: anders-elastisys <112394389+anders-elastisys@users.noreply.github.com>

Author: Zash

config/config/common-config.yaml

@@ -262,7 +262,7 @@ fluentd:
 
     tolerations: []
 
-    nodeSelector: ""
+    nodeSelector: {}
     affinity: {}
 
   forwarder:
@@ -287,7 +287,7 @@ fluentd:
         key: node-role.kubernetes.io/master
         value: ""
 
-    nodeSelector: ""
+    nodeSelector: {}
     affinity: {}
 
     livenessThresholdSeconds: 900