Delay load shell32 (#30889)
### Description
PR https://github.com/microsoft/onnxruntime/pull/27379 introduced a
static dependency on shell32.dll. Since shell32.dll depends on
user32.dll, this prevents loading onnxruntime.dll in processes that
enabled the mitigation
PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY.DisallowWin32kSystemCalls
(Win32k lockdown), causing an ERROR_INTERNAL_ERROR (1359).
The use of shell32.dll is only for svchost processes, so it's okay to
just delay load it.
### Motivation and Context
WebNN is migrating ORT graph compilation to a sandboxed process with
Win32k lockdown. Dependency on shell32.dll will cause onnxruntime.dll to
fail to get loaded in that process.
