[preview] update the VM image to have parity with production

This:
1. updates from K3s 1.23 to 1.26
2. requires that we remove PodSecurityPolicy changes (as it's no longer supported)
3. resolves intermittent disk pressure issues

Author: kylos101

dev/preview/BUILD.yaml

@@ -33,7 +33,7 @@ scripts:
       export TF_VAR_preview_name="${TF_VAR_preview_name:-$(previewctl get name)}"
       export TF_VAR_vm_cpu="${TF_VAR_vm_cpu:-6}"
       export TF_VAR_vm_memory="${TF_VAR_vm_memory:-12Gi}"
-      export TF_VAR_vm_storage_class="${TF_VAR_vm_storage_class:-longhorn-gitpod-k3s-202209251218-onereplica}"
+      export TF_VAR_vm_storage_class="${TF_VAR_vm_storage_class:-longhorn-gitpod-k3s-202304191605-onereplica}"
       ./workflow/preview/deploy-harvester.sh
 
   - name: delete-preview

dev/preview/infrastructure/modules/gce/variables.tf

@@ -44,7 +44,7 @@ variable "harvester_ingress_ip" {
 variable "vm_image" {
   type        = string
   description = "The VM image"
-  default     = "gitpod-k3s-202302132222"
+  default     = "gitpod-k3s-202304191605"
 }
 
 variable "cert_issuer" {

dev/preview/infrastructure/modules/harvester/variables.tf

@@ -33,7 +33,7 @@ variable "ssh_key" {
 variable "vm_image" {
   type        = string
   description = "The VM image"
-  default     = "gitpod-k3s-202209251218"
+  default     = "gitpod-k3s-202304191605"
 }
 
 variable "harvester_ingress_ip" {

dev/preview/infrastructure/variables.tf

@@ -35,7 +35,7 @@ variable "vm_type" {
 variable "vm_image" {
   type        = string
   description = "The VM image"
-  default     = "gitpod-k3s-202209251218"
+  default     = "gitpod-k3s-202304191605"
 }
 
 variable "cert_issuer" {