Fix WinML Test Case: create LearningModelBinding for every testcase

[Yi Zhang (mszhanyi)]

Description

Fixes #13509

Motivation and Context

The exception was caused by the incorrect fetches, which was from the binding with last test cases.

onnxruntime/onnxruntime/core/session/onnxruntime_c_api.cc

Lines 809 to 815 in efcbdac

	std::vector<OrtValue> fetches(output_names_len);
	for (size_t i = 0; i != output_names_len; ++i) {
	if (output[i] != nullptr) {
	::OrtValue& value = *(output[i]);
	if (value.Fence())
	value.Fence()->BeforeUsingAsOutput(onnxruntime::kCpuExecutionProvider, queue_id);
	fetches[i] = value;