CXPlat must initialize all sub-components prior to enabling fault injection

        [2]              : "cxplat_fault_injection_inject_fault + 67 D:\a\ebpf-for-windows\ebpf-for-windows\external\usersim\cxplat\src\cxplat_winuser\fault_injection.cpp 408" [Type: std::basic_string<char,std::char_traits<char>,std::allocator<char> >]
        [3]              : "cxplat_allocate + 111 D:\a\ebpf-for-windows\ebpf-for-windows\external\usersim\cxplat\src\cxplat_winuser\memory_winuser.cpp 89" [Type: std::basic_string<char,std::char_traits<char>,std::allocator<char> >]
        [4]              : "_get_processor_group_info + 174 D:\a\ebpf-for-windows\ebpf-for-windows\external\usersim\cxplat\src\cxplat_winuser\processor_winuser.cpp 29" [Type: std::basic_string<char,std::char_traits<char>,std::allocator<char> >]
        [5]              : "cxplat_winuser_initialize_processor_info + 94 D:\a\ebpf-for-windows\ebpf-for-windows\external\usersim\cxplat\src\cxplat_winuser\processor_winuser.cpp 48" [Type: std::basic_string<char,std::char_traits<char>,std::allocator<char> >]
        [6]              : "cxplat_initialize + 598 D:\a\ebpf-for-windows\ebpf-for-windows\external\usersim\cxplat\src\cxplat_winuser\cxplat_winuser.cpp 162" [Type: std::basic_string<char,std::char_traits<char>,std::allocator<char> >]
        [7]              : "usersim_platform_initiate + 68 D:\a\ebpf-for-windows\ebpf-for-windows\external\usersim\src\platform_user.cpp 56" [Type: std::basic_string<char,std::char_traits<char>,std::allocator<char> >]

The above stack shows how #143 caused a regression. The cxplat_winuser_initialize_processor_info itself is getting fault-injected and cxplat is failing to initialize. It goes to cxplat cleaup path - where it is trying to wait on the rundown_ref object which is not intialized and hence throws an exception.

01 VCRUNTIME140D!_CxxThrowException
02 usersim!_rundown_ref_table::wait_for_rundown_ref
03 usersim!cxplat_wait_for_rundown_protection_release
04 usersim!cxplat_wait_for_preemptible_work_items_complete
05 usersim!usersim_platform_terminate
06 usersim!usersim_platform_initiate
07 usersim!DllMain

Start at cxplat_winuser.cpp in cxplat_initialize and trace the initialization and cleanup paths through processor_winuser.cpp, fault_injection.cpp, and usersim_platform_terminate. Reproduce the fault-injected processor initialization path and verify cleanup does not wait on an uninitialized rundown_ref; completion should cover the regression described in the stack traces.