Ordered Push don't cancel sub if trying to recover

[scottf]

Didn't quite get ordered push recovery correct, fixed it. See #1043

The PR addresses consumer recovery when the client is disconnected from a server or when the stream or consumer leader is affected by an outage. At least the following situations are covered

1. Durable Push Consumer
2. Ephemeral Push Consumer with a long enough inactive threshold to survive a server outage or disconnection
3. Ordered Push Consumer
4. Durable Pull Consumer when used with endless Simplification API
5. Ephemeral Pull Consumer with a long enough inactive threshold to survive a server outage or disconnection when used with endless Simplification API
6. Ordered Pull Consumer with endless Simplification