fix: leave a zombie for the next sweep when its scopes cannot be read

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014FHGE3ynoAu6yrgeg4kLwL

backend/windmill-queue/src/jobs.rs

@@ -3744,6 +3744,8 @@ impl From<QueuedJobV2> for MiniCompletedJob {
             // `QueuedJobV2` carries no args, and nothing reaches the restart gate
             // through this conversion — the worker completes jobs from the pulled job.
             build_binary_only: false,
+            // Nor scopes: a caller whose completion can re-run the job fills them in from
+            // `job_perms` while the job is still queued.
             job_token_scopes: None,
         }
     }