Core/Misc: Remove non-portable hack of including <__msvc_chrono.hpp> - will break in future MSVC release (#30460)

(cherry picked from commit 96956b0e5b74884ff8f7bede5c8c11adbb5ee873)

Author: StephanTLavavej

src/common/Utilities/Duration.h

@@ -18,12 +18,7 @@
 #ifndef _DURATION_H_
 #define _DURATION_H_
 
-// HACKS TERRITORY
-#if __has_include(<__msvc_chrono.hpp>)
-#include <__msvc_chrono.hpp> // skip all the formatting/istream/locale/mutex bloat
-#else
 #include <chrono>
-#endif
 
 /// Milliseconds shorthand typedef.
 typedef std::chrono::milliseconds Milliseconds;