fix: pause non-flowing subscription

[mohwahab]

Expected Retry Behaviour

1. A retry should be triggered if the consumer replies with a retriable error and the Max Retry configuration is > 0.
2. No further retries should be triggered once retries are exhausted (retry_count == Max Retry). i.e. Receiving new event(s) should not trigger a retry.
3. No retry should be triggered if the consumer replies with a non-retriable error.
4. A manual restart resets the retry count, a retry should be triggered (applies to any non-flowing subscription).
5. An automatic refresh (every 10 mins) resets the retry count, a retry should be triggered (applies to any non-flowing subscription).
6. Receiving new event(s) to a non-flowing subscription should not trigger a retry.

[Rotorsoft]

LGTM 🚀