clean-slate-deployment should behave gracefully if there is nothing to clean #9678
Description
Is your feature request related to a problem? Please describe
Right now, the deploy-to-preview-environments on main fails, because the job has clean-slate-deployment enabled but there is no old preview environment to clean.
Example: https://werft.gitpod-dev.com/job/gitpod-build-main.3090
Describe the behaviour you'd like
Don't fail if clean-slate-deployment is enabled but there is nothing to clean.
Describe alternatives you've considered
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