The aggregation helpers library is providing a shardVersionRetry method to retry commands that have thrown exceptions with error codes from the StaleShardVersionError category.

Refactor the method in the following way:

• Pull it out from agg_helpers, since it's used in several parts not all related to aggregation. And it is more correct to keep it under "sharding path".

• Remove the two invariants (1 , 2) checking that the exception happened on the same namespace of the request because:
  1. When renameCollection for sharded collection will be allowed, there could be stale shard versions thrown both on source and target namespaces.
  2. The correct thing to do, is refreshing the shard version of the namespace the exception was thrown on.

• Remove the namespace argument: it should be extracted from the exception's extra info. [This could not be done because of multiversion suites]

On the side, it is needed to ensure that every stale exception carries the namespace to be refreshed.