fix(scripts): tell an empty cleanup scan apart from an unreachable one

The cleanup printed one number for expired owners, the count of
workspaces it found, so zero meant either that nobody had passed the
grace period or that everyone who had owns nothing. The first is normal
and the second means media is held alive by rows the cleanup cannot
reach, and telling them apart took a hand-written query against
production. Both counts are reported now.

Bunny and R2 results were also discarded. The workspace row is deleted
first, so a refused storage delete leaves media that nothing points at,
and nothing recorded that it happened. logCleanupWarnings already exists
for this and is now called with the per-workspace result.

scripts/r2-orphan-cleanup.ts

@@ -209,6 +209,7 @@ async function main() {
   console.log(`[r2-orphan-cleanup] Starting (${dryRun ? 'dry-run' : 'delete mode'})`);
 
   const expiredBillingCleanup = await cleanupExpiredBillingWorkspaces({ dryRun });
+  console.log(`[r2-orphan-cleanup] Expired owners past grace: ${expiredBillingCleanup.owners}`);
   console.log(
     `[r2-orphan-cleanup] Expired owner workspaces scanned: ${expiredBillingCleanup.scanned}`
   );