[otel/kube-stack] Update the OpenTelemetry Kube Stack Helm Chart to latest versions (elastic#12341)

* chore: Update tested OpenTelemetry Kube Stack Helm Chart in k8s.go

Made with ❤️️ by updatecli

* chore: Update local OpenTelemetry Kube Stack Helm Chart files

Made with ❤️️ by updatecli

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

testing/integration/k8s/k8s.go

@@ -7,7 +7,7 @@ package k8s
 import "path/filepath"
 
 const (
-	KubeStackChartVersion         = "0.12.6"
+	KubeStackChartVersion         = "0.12.7"
 	KubeStackChartName            = "opentelemetry-kube-stack"
 	KubeStackChartNameWithVersion = KubeStackChartName + "-" + KubeStackChartVersion
 	KubeStackChartArchiveName     = KubeStackChartNameWithVersion + ".tgz"

testing/integration/k8s/testdata/opentelemetry-kube-stack/Chart.yaml

@@ -34,4 +34,4 @@ name: opentelemetry-kube-stack
 sources:
 - https://github.com/open-telemetry/opentelemetry-operator
 type: application
-version: 0.12.6
+version: 0.12.7

testing/integration/k8s/testdata/opentelemetry-kube-stack/templates/collector.yaml

@@ -121,6 +121,12 @@ spec:
   deploymentUpdateStrategy:
   {{- toYaml . | nindent 4}}
   {{- end }}
+  {{- end }}
+   {{- if eq $collector.mode "statefulset" }}
+  {{- with $collector.persistentVolumeClaimRetentionPolicy }}
+  persistentVolumeClaimRetentionPolicy:
+  {{- toYaml . | nindent 4}}
+  {{- end }}
   {{- end }}
   {{- if or ($collector.presets.logsCollection.enabled) ($collector.presets.logsCollection.storeCheckpoints) ($collector.presets.hostMetrics.enabled) ($collector.volumeMounts) }}
   volumeMounts:

testing/integration/k8s/testdata/opentelemetry-kube-stack/values.yaml

@@ -327,6 +327,11 @@ defaultCRConfig:
   deploymentUpdateStrategy: {}
   #   type: RollingUpdate
 
+  # Retention policy for the PersistentVolumeClaim https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#persistentvolumeclaim-retention
+  persistentVolumeClaimRetentionPolicy: {}
+    # whenDeleted: Retain
+    # whenScaled: Retain
+
   # Volume mounts for the collector
   volumeMounts: []
   #   - name: data