Get rid of bitnami images (#1374)

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

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## What this PR does

This PR removes bitnami images from all charts. Bitnami has deprecated
their free images, see details here:
- https://github.com/bitnami/charts/issues/35164

Also dashboard has moved helper images to `bitnamilegacy`, we will fully
replace it by our new dashboard soon:
- https://github.com/cozystack/cozystack/pull/1269

### Release note

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```release-note
Get rid of bitnami images
```

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* New Features
* Added configurable image overrides for Kubeapps components (frontend,
auth proxy, Redis, kubectl).
  * Introduced image settings for Velero’s kubectl helper.
  * Added image configuration for Vertical Pod Autoscaler components.
  * Added a configurable resize hook image for SeaweedFS volumes.

* Chores
* Standardized kubectl-related images to alpine/k8s:1.33.4 across
multiple operational hooks (VM update, PVC resize, etcd maintenance,
SeaweedFS pre-upgrade), with no behavioral changes.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/system/dashboard/values.yaml

@@ -21,7 +21,18 @@ kubeapps:
       repository: dashboard
       tag: v0.36.0-alpha.1
       digest: "sha256:54906b3d2492c8603a347a5938b6db36e5ed5c4149111cae1804ac9110361947"
+  frontend:
+    image:
+      repository: bitnamilegacy/nginx
+  authProxy:
+    image:
+      repository: bitnamilegacy/oauth2-proxy
   redis:
+    image:
+      repository: bitnamilegacy/redis
+    kubectl:
+      image:
+        repository: bitnamilegacy/kubectl
     master:
       resourcesPreset: "none"
       resources:

packages/system/seaweedfs/templates/hook.yaml

@@ -26,7 +26,7 @@ spec:
       serviceAccountName: seaweedfs-hook
       containers:
         - name: kubectl
-          image: bitnami/kubectl:latest
+          image: docker.io/alpine/k8s:1.33.4
           command:
           - sh
           args:

packages/system/seaweedfs/values.yaml

@@ -21,6 +21,8 @@ seaweedfs:
       type: ""
   volume:
     replicas: 2
+    resizeHook:
+      image: docker.io/alpine/k8s:1.33.4
     # minimum free disk space(in percents). If free disk space lower this value - all volumes marks as ReadOnly
     minFreeSpacePercent: 5
     dataDirs:

packages/system/velero/values.yaml

@@ -13,3 +13,7 @@ velero:
     volumeSnapshotLocation: null
     namespace: cozy-velero
     features: EnableCSI
+  kubectl:
+    image:
+      repository: docker.io/alpine/k8s
+      tag: 1.33.4

packages/system/vertical-pod-autoscaler/values.yaml

@@ -4,6 +4,11 @@ vertical-pod-autoscaler:
   crds:
     enabled: false
 
+    image:
+      registry: docker.io
+      repository: alpine/k8s
+      tag: 1.33.4
+
   updater:
     resources:
       limits: