GraphQL: Querying user workspaces for a different user shows workspaces of logged-in user
## Problem
Given the following ~GraphQL query:
```graphql
query {
user(username:"gitlab.mschoenlaub") {
id
workspaces {
nodes {
name
user {
id
}
actualState
}
}
}
}
```
Logged in as @splattael I see a list of workspaces from logged-in user:
## Proposed solution
Error out if showing workspaces for different users is not possible.
issue