Fix preview delete job

[vulkoingim]

Description

#14091 changed the configurations of the tf providers, but forgot the change the delete job to populate the correct kube contexts.

Related Issue(s)

Fixes https://werft.gitpod-dev.com/job/gitpod-custom-head.3147

╷
│ Error: context "harvester" does not exist
│
│   with provider["registry.terraform.io/harvester/harvester"].harvester,
│   on provider.tf line 25, in provider "harvester":
│   25: provider "harvester" {
│
╵
╷
│ Error: Provider configuration: cannot load Kubernetes client config
│
│   with provider["registry.terraform.io/hashicorp/kubernetes"].harvester,
│   on provider.tf line 37, in provider "k8s":
│   37: provider "k8s" {
│
│ context "harvester" does not exist
╵

How to test

Release Notes

NONE

Documentation

Werft options:

• /werft with-local-preview
  If enabled this will build install/preview
• /werft with-preview
• /werft with-large-vm
• /werft with-integration-tests=all
  Valid options are all, workspace, webapp, ide

[meysholdt]

🚀