fix external profilers crashing when starting the server #5642
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when launching through external profilers like ANTS or dotTrace in modes other than sampling/timeline, because of ???? we get an invalid handle error when trying to open files that don't exist, causing the entire program to crash
added a check for running under a profiler (yes i hate the nullable bool and scanning modules, but i dont know of a better way to do this) then we always check if the file exists in those cases
normal execution is still fast, we only eat the performance hit when running under these profilers (wont affect timeline though if you attach it later)