Ensure temp zip file cleanup with try-finally pattern

[Copilot]

The temporary zip file created during upload could leak if errors occurred after creation but before the cleanup step (e.g., upload failure, job submission failure).

Changes:

• Wrapped upload/job submission in try-finally block
• Moved cleanup to finally block with existence check
• Ensures cleanup happens regardless of success/failure path

Before:

await createZip({...})
// ... upload and process
fs.unlinkSync(tmpZipFile)  // Only runs if no errors above

After:

await createZip({...})
try {
  // ... upload and process
  return jobs
} finally {
  if (fs.existsSync(tmpZipFile)) {
    fs.unlinkSync(tmpZipFile)
  }
}

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[madebydavid]

Not merging - cleanup was changed