chore(storage): Remove gRPC backwards compatibility shims #15146
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Since gRPC is now GA, removing the backwards compatibility shims for gRPC.
storage_experimental
namespace is still present in grpc_plugin.h as it has the members related to gRPC metrics likeEnableGrpcMetricsOption
andGrpcMetricsPeriodOption
. I'm not sure whether this is completely implemented.Simplify MakeGrpcClient(): drop the
UseRest()
branch and ENV-var fallback so it unconditionally returns a gRPC-backed Client. Previously MakeGrpcClient() could return JSON client by comparing the ENV variable. Now it is removed so that we've a clear separation of gRPC and JSON clients.Refactored unit tests as per the new behavior.
This change is