Apply singleton instance binding clean-up fix no matter how it is created

[dsnopek]

Fixes #1900

This fix is a little weird in that it only addresses the Wrapped(GodotObject *) constructor, but I think that's actually correct, because we only want to do this when the instance binding creation was initiated on the engine side using a pre-existing instance. If someone creates a new instance of a singleton (which they really shouldn't do, but there's nothing preventing it) then it shouldn't register that as an engine singleton.

[Naros]

Hi @dsnopek so the game does not crash, but the Godot Editor (beta2) still crashes on exit. I am updating my local windows builds to rc2 with debug symbols and will report back.

================================================================
CrashHandlerException: Program crashed with signal 11
Engine version: Godot Engine v4.6.beta2.official (551ce8d47feda9c81c870314745366b24957624b)
Dumping the backtrace.
[1] error(-1): no debug info in PE/COFF executable
[2] error(-1): no debug info in PE/COFF executable
[3] error(-1): no debug info in PE/COFF executable
[4] error(-1): no debug info in PE/COFF executable
[5] error(-1): no debug info in PE/COFF executable
[6] error(-1): no debug info in PE/COFF executable
-- END OF C++ BACKTRACE --
================================================================

With rc2 debug symbols enabled

================================================================
CrashHandlerException: Program crashed
Engine version: Godot Engine v4.6.rc.custom_build (78c6632eb174aabb2790975cf83e28fee065b43d)
Dumping the backtrace.
[0] <couldn't map PC to fn name>
[1] <couldn't map PC to fn name>
[2] Object::~Object (E:\GitHub\godotengine2\core\object\object.cpp:2466)
[3] GDExtensionManager::`scalar deleting destructor'
[4] unregister_core_types (E:\GitHub\godotengine2\core\register_core_types.cpp:426)
[5] Main::cleanup (E:\GitHub\godotengine2\main\main.cpp:5252)
[6] widechar_main (E:\GitHub\godotengine2\platform\windows\godot_windows.cpp:105)
[7] _main (E:\GitHub\godotengine2\platform\windows\godot_windows.cpp:128)
[8] main (E:\GitHub\godotengine2\platform\windows\godot_windows.cpp:140)
[9] __scrt_common_main_seh (D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288)
[10] <couldn't map PC to fn name>
-- END OF C++ BACKTRACE --
================================================================

This includes the godot-cpp v10 patch from this PR