Worker executor wraps some gRPC calls with retry logic twice

[vigoo]

It uses GrpcClient which already does retries, and wraps it in a secondary layer of retrying unnecessarily.

[vigoo]

This is by design, the inner retry is just recreating connections of the gRPC connection pool while the outer retry logic deals with all kind of retriable errors.
This could be unified later but it is not a bug now.