### Description
This change fixes the WebGPU delay load test.
<details>
<summary>Fix UB in macro</summary>
The following C++ code outputs `2, 1` in MSVC, while it outputs `1, 1`
in GCC:
```c++
#include <iostream>
#define A 1
#define B 1
#define ENABLE defined(A) && defined(B)
#if ENABLE
int x = 1;
#else
int x = 2;
#endif
#if defined(A) && defined(B)
int y = 1;
#else
int y = 2;
#endif
int main()
{
std::cout << x << ", " << y << "\n";
}
```
Clang reports `macro expansion producing 'defined' has undefined
behavior [-Wexpansion-to-defined]`.
</details>
<details>
<summary>Fix condition of build option
onnxruntime_ENABLE_DELAY_LOADING_WIN_DLLS</summary>
Delay load is explicitly disabled when python binding is being built.
modifies the condition.
</details>
### Description
This change fixes the DLL delay load problem for the WebGPU EP and
DirectML EP. See detailed explanation below.
### Problem
When onnxruntime.dll uses delay loading for its dependencies, the
dependencies are loaded using `LoadLibraryEx()`, which search the
directory of process (.exe) instead of this library (onnxruntime.dll).
This is a problem for usages of Node.js binding and python binding,
because Windows will try to find the dependencies in the directory of
node.exe or python.exe, which is not the directory of onnxruntime.dll.
There was previous attempt to fix this by loading DirectML.dll in the
initialization of onnxruntime nodejs binding, which works for DML EP but
is not a good solution because it does not really "delay" the load.
For WebGPU, the situation became worse because webgpu_dawn.dll depends
on dxil.dll and dxcompiler.dll, which are explicitly dynamically loaded
in the code using `LoadLibraryA()`. This has the same problem of the DLL
search.
### Solutions
For onnxruntime.dll loading its direct dependencies, it can be resolved
by set the [`__pfnDliNotifyHook2`
hook](https://learn.microsoft.com/en-us/cpp/build/reference/understanding-the-helper-function?view=msvc-170#structure-and-constant-definitions)
to load from an absolute path that constructed from the onnxruntime.dll
folder and the DLL name.
For webgpu_dawn.dll loading dxil.dll and dxcompiler.dll, since they are
explicitly loaded in the code, the hook does not work. Instead, it can
be resolved by ~~using WIN32 API `SetDllDirectory()` to add the
onnxruntime.dll folder to the search path.~~ preloading the 2 DLLs from
the onnxruntime.dll folder .
