Account Deletion might fail due to very old workspaces for unregistered clusters


![image](https://user-images.githubusercontent.com/32448529/165919998-084c6c2c-38c1-4291-ba8a-91aa0f931503.png)


Internal discussion: https://gitpod.slack.com/archives/C032A46PWR0/p1651224485195929

Might very well be the cause for: https://github.com/gitpod-io/gitpod/issues/9631