[preview] use k3s 1.26

[kylos101]

Description

Relates to ENG-680

Summary generated by Copilot

🤖 Generated by Copilot at 0578868

This pull request refactors the image variable for the Gitpod preview environment on GCP. It updates the default image to the latest version, moves the variable definition to the gce module, and removes unused references to the variable.

Related Issue(s)

Fixes # n/a

How to test

Observe typical and large VMs have expected free space for containerd and workspaces.

Documentation

Preview status

Gitpod was successfully deployed to your preview environment.

• 🏷️ Name - kylos101-g338a766054
• 🔗 URL - kylos101-g338a766054.preview.gitpod-dev.com/workspaces.
• 📚 Documentation - See our internal documentation for information on how to interact with your preview environment.
• 📦 Version - kylos101-gen104-image-gha.15824

Build Options

Build

• /werft with-werft
  Run the build with werft instead of GHA
• leeway-no-cache
• /werft no-test
  Run Leeway with --dont-test

Publish

• /werft publish-to-npm
• /werft publish-to-jb-marketplace

Installer

• analytics=segment
• with-dedicated-emulation
• workspace-feature-flags
  Add desired feature flags to the end of the line above, space separated

Preview Environment / Integration Tests

• /werft with-local-preview
  If enabled this will build install/preview
• /werft with-preview
• /werft with-large-vm
• /werft with-gce-vm
  If enabled this will create the environment on GCE infra
• with-integration-tests=all
  Valid options are all, workspace, webapp, ide, jetbrains, vscode, ssh. If enabled, with-preview and with-large-vm will be enabled.
• with-monitoring

/hold