[ws-manager-mk2] Add finalizer on workspace, handle ws deletion

[WVerlaek]

Description

• Add finalizer on the Workspace resource as well - such that deleting the workspace resource directly (instead of the Pod) still gracefully stops the workspace.
• Handle deleting the workspace resource, by propagating the deletion to the Pod, which then continuous deletion as normal.
• Once the workspace transitions to a Stopped phase, remove the finalizer on the workspace and finish deletion.

Related Issue(s)

Part of #11416

How to test

• Open a workspace
• kubectl delete ws <name>
• Observe the workspace gracefully shuts down with a backup, and eventually disappears from the cluster in kubectl get ws.

Release Notes

NONE

Documentation

Build Options:

• /werft with-github-actions
  Experimental feature to run the build with GitHub Actions (and not in Werft).
• leeway-no-cache
  leeway-target=components:all
• /werft no-test
  Run Leeway with --dont-test

Publish Options

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

Installer Options

• with-ee-license
• with-slow-database
• with-dedicated-emulation
• with-ws-manager-mk2
• workspace-feature-flags
  Add desired feature flags to the end of the line above, space separated

Preview Environment Options:

• /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
• /werft with-integration-tests=all
  Valid options are all, workspace, webapp, ide, jetbrains, vscode, ssh

[werft-gitpod-dev-com]

started the job as gitpod-build-wv-mk2-workspace-finalizer.1 because the annotations in the pull request description changed
(with .werft/ from main)

[WVerlaek]

/werft run

👍 started the job as gitpod-build-wv-mk2-workspace-finalizer.2
(with .werft/ from main)

[WVerlaek]

/werft run with-wsman-mk2 recreate-vm

👍 started the job as gitpod-build-wv-mk2-workspace-finalizer.3
(with .werft/ from main)

[WVerlaek]

/werft run with-wsman-mk2 recreate-vm

👍 started the job as gitpod-build-wv-mk2-workspace-finalizer.4
(with .werft/ from main)