Rename Labkit::Tracing::GRPCInterceptor to GRPC::ClientInterceptor
Rename Labkit::Tracing::GRPCInterceptor to GRPC::ClientInterceptor

The original name has been deprecated

mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq