Create initial dashboard for cardinality management

Signed-off-by: ArthurSens <[email protected]>

Author: ArthurSens

operations/observability/mixins/self-hosted/dashboards.libsonnet

@@ -8,5 +8,6 @@
     'gitpod-sh-example-overview.json': (import 'dashboards/examples/overview.json'),
     'argocd.json': (import 'dashboards/argocd/argocd.json'),
     'observability.json': (import 'dashboards/observability/observability.json'),
+    'cardinality-management-overview.json': (import 'dashboards/observability/cardinality-management-overview.json'),
   },
 }