fix(v2): set grpc.WithMaxCallAttempts() for the query backend client #3682
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I missed one important change in #3675, it got accidentally reverted in one of my tests. We need to set the global
grpc.WithMaxCallAttempts(500)in addition to the"MaxAttempts": 500on the method retry policy.As per https://github.com/grpc/grpc-go/blob/5e99daea2f11c6f9fab99470e71c6a92138f1875/service_config.go#L284-L286, the per-method
maxAttemptsis only used if it is smaller than the globalmaxAttemptswhich defaults to 5.