[ws-manager] Add volume snapshot events to workspace pod event

[jenting]

Description

It would be great if we could add events to the workspace pod that shows the progress of volume snapshot operations, we could see the event by kubectl describe pods <workspace-pod-name>.
That way it will be easier to debug later on if the workspace pod is stuck or misbehaving.

Related Issue(s)

Fixes #10887

How to test

1. Create a preview environment and enable the feature flag persistent_volume_claim.
2. Launch a workspace and write a large data into it.

   dd if=/dev/urandom of=data bs=16M count=256

3. Stop the workspace.
4. During the workspace stopping, kubectl describe the workspace pod to see the volume snapshot event.

   kubectl describe pod -l component=workspace

Release Notes

[experimental] Add volume snapshot events to workspace pod event

Documentation

None

Werft options:

• /werft with-preview

[werft-gitpod-dev-com]

started the job as gitpod-build-jenting-add-volume-snapshot-related-10887.4 because the annotations in the pull request description changed
(with .werft/ from main)