fix(common): create default gRPC credentials only if needed #10280
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For backwards compatibility with the pre-Unified Credentials world we were calling
grpc::GoogleDefaultCredentials()
ifg::c::GrpcCredentialsOption
was not set. In many cases the option is not set, butg::c::UnifiedCredentialsOption
is. If that is the case, the unified options are preferred. Callinggrpc::GoogleDefaultCredentials()
produces spurious errors, and these credentials won't be used.This change is