Add PVC support to prebuilds

[sagor999]

Description

This PR adds support for PVC to prebuilds.
You can now enable PVC in your project settings, and all prebuilds going forward will use PVC and backup prebuild result into Volume Snapshot. When you open workspace from such prebuild, it will automatically opt in into using PVC feature.
Prebuilds using PVC can only be opened using PVC feature.
If something is not working or broken, you just disable that option in project setting and trigger a new prebuild to use old method.

Opening workspace from a prebuild that contains a lot of data should be much faster when using PVC.

Related Issue(s)

Fixes #10260

How to test

1. Open preview environment
2. Add your project.
3. Go into project settings and enable PVC feature flag.
4. Trigger new prebuild.
5. Open workspace from that prebuild.

For extra points:
Enable incremental prebuilds, and observe that this works correctly with PVC feature enabled as well.

Release Notes

none

Documentation

Werft options:

• /werft with-preview

[sagor999]

/werft run with-clean-slate-deployment=true with-preview=true

👍 started the job as gitpod-build-pavel-10260.23
(with .werft/ from main)

[werft-gitpod-dev-com]

started the job as gitpod-build-pavel-10260.25 because the annotations in the pull request description changed
(with .werft/ from main)

[jenting]

Code LGTM, thank you

[laushinka]

/werft run

👍 started the job as gitpod-build-pavel-10260.29
(with .werft/ from main)

[sagor999]

/werft run with-clean-slate-deployment=true

👍 started the job as gitpod-build-pavel-10260.30
(with .werft/ from main)

[laushinka]

Tested - starting workspace and prebuild logs look good with and without the PVC setting.

LGTM