Fix notarize script cleanup to be idempotent (#5288)

Use rm -f instead of rm when cleaning up the zip file after notarization.
The zip may already be deleted if a previous step failed and was retried,
causing the script to fail even when notarization actually succeeded.

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

scripts/notarize_mac_app.sh

@@ -46,8 +46,8 @@ STATUS=$(echo "$SUBMIT_OUTPUT" | grep "^  status:" | awk '{print $2}')
 echo "Submission ID: $SUBMISSION_ID"
 echo "Status: $STATUS"
 
-# Clean up the zip
-rm "$ZIP_PATH"
+# Clean up the zip (use -f to avoid failure if already deleted)
+rm -f "$ZIP_PATH"
 
 if [ "$STATUS" != "Accepted" ]; then
     echo "=== Notarization failed! Fetching log for details ==="