[wpiutil] Remove roboRIO-specific timestamp code (#7669)

ntcore/src/dev/native/cpp/main.cpp

@@ -32,8 +32,6 @@ void stress();
 void stress2();
 
 int main(int argc, char* argv[]) {
-  wpi::impl::SetupNowDefaultOnRio();
-
   if (argc == 2 && std::string_view{argv[1]} == "bench") {
     bench();
     return EXIT_SUCCESS;

ntcore/src/test/native/cpp/main.cpp

@@ -11,7 +11,6 @@
 #include "ntcore.h"
 
 int main(int argc, char** argv) {
-  wpi::impl::SetupNowDefaultOnRio();
   nt::AddLogger(nt::GetDefaultInstance(), 0, UINT_MAX, [](auto& event) {
     if (auto msg = event.GetLogMessage()) {
       std::fputs(msg->message.c_str(), stderr);