Refactor plutono Helm chart into Golang component (gardener#8213)

* Add basic template

* Copy dashboards to `plutono` pkg

Embed doesn't support symlinks therefore common folder is created to keep common dashboards

* Refactor charts to golang component

* Add test for refactored code

* Move logging to specific component

* Introduce shared component

* Adapt shoot reconciliations

* Adapt seed reconciliation

* Drop plutono charts

* Update skaffold.yaml

* Address review

* make use of `QuantityPtr` wherever possible

* Address review

* Streamline plutono volumes

* Address review

charts/seed-bootstrap/values.yaml

@@ -100,10 +100,6 @@ aggregatePrometheus:
         value: 2Gi
         percentage: 80
 
-plutono:
-  hostName: p.seed-1.example.com
-  secretName: plutono-tls
-
 allowedMetrics:
   alertmanager: []
 
@@ -206,7 +202,6 @@ global:
     alertmanager: image-repository:image-tag
     alpine: image-repository:image-tag
     configmap-reloader: image-repository:image-tag
-    plutono: image-repository:image-tag
     prometheus: image-repository:image-tag
 
 alertmanager: