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nodejs: Release Ort Env before main function returns (microsoft#17288)
### Description Release OrtEnv before main function returns. Before this change, OrtEnv is deleted when C/C++ runtime destructs all global variables in ONNX Runtime's core framework. The callstack is like this: ``` * frame #0: 0x00007fffee39f5a6 libonnxruntime.so.1.16.0`onnxruntime::Environment::~Environment(this=0x00007fffee39fbf2) at environment.h:20:7 frame microsoft#1: 0x00007fffee39f614 libonnxruntime.so.1.16.0`std::default_delete<onnxruntime::Environment>::operator()(this=0x00007ffff4c30e50, __ptr=0x0000000005404b00) const at unique_ptr.h:85:2 frame microsoft#2: 0x00007fffee39edca libonnxruntime.so.1.16.0`std::unique_ptr<onnxruntime::Environment, std::default_delete<onnxruntime::Environment>>::~unique_ptr(this=0x5404b00) at unique_ptr.h:361:17 frame microsoft#3: 0x00007fffee39e2ab libonnxruntime.so.1.16.0`OrtEnv::~OrtEnv(this=0x00007ffff4c30e50) at ort_env.cc:43:1 frame microsoft#4: 0x00007fffee39fa96 libonnxruntime.so.1.16.0`std::default_delete<OrtEnv>::operator()(this=0x00007fffefff8f78, __ptr=0x00007ffff4c30e50) const at unique_ptr.h:85:2 frame microsoft#5: 0x00007fffee39f394 libonnxruntime.so.1.16.0`std::unique_ptr<OrtEnv, std::default_delete<OrtEnv>>::~unique_ptr(this=0x7ffff4c30e50) at unique_ptr.h:361:17 frame microsoft#6: 0x00007ffff78574b5 libc.so.6`__run_exit_handlers + 261 frame microsoft#7: 0x00007ffff7857630 libc.so.6`exit + 32 frame microsoft#8: 0x00007ffff783feb7 libc.so.6`__libc_start_call_main + 135 frame microsoft#9: 0x00007ffff783ff60 libc.so.6`__libc_start_main@@GLIBC_2.34 + 128 frame microsoft#10: 0x0000000000abbdee node`_start + 46 ``` After this change, OrtEnv will be deleted before the main function returns and nodejs is still alive.
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