node: fix e2e reader limit test — heartwood

Either error can show up it, according to our wumpus hunter¹. Check for both reasons.

¹

https://wumpus.liw.fi/log-f30760d6bb86d2978a5ed4df8ee45b9aa97778b4/log-2025-05-02T03:42:38Z.1885.fail.html

     let FetchResult::Failed { reason } = result else {
         panic!("fetch result must be failed")
     };
     // Either gitoxide will error by being unable to consume the packet, or the
     // byte limit error will be returned
     assert!(
         reason.contains("Failed to consume the pack sent by the remote"),
         reason.contains("Failed to consume the pack sent by the remote")
             || reason.contains("exceeded number of allowed bytes"),
         "actual: {}",
         reason
     );