Feature Request: Retry vstream on a new tablet if an error is encountered

[twthorn]

Feature Description

vstream manager on vtgate will, for certain errors, always retry on the same tablet, and never switch to a new tablet. This means the vstream could be failing indefinitely for any error code that is not Invalid arg/GTID set mismatch. We have no guarantee that these are transient errors and we must try other tablets to provide higher availability of vstreams. We should simplify the retry logic and always try a new tablet if the one we attempted to set up a vstream fails. We will still prefer local cell (it is the first we try on restarts, and after the 3 retries are maxed out).

Use Case(s)

For cases where a user has a shard with a local cell tablet that keeps returning any error that is not GTID set mismatch, it will cause an outage/no data streamed. Adapt the retry algorithm so other tablets are tried on failure.