[TRT EP] Fix build error for building oss onnx-tensorrt parser (micro…

…soft#17468)

If building ORT TRT with `--use_tensorrt_oss_parse` (meaning ORT wil
include [oss onnx-tensorrt
parser](https://github.com/onnx/onnx-tensorrt/blob/main/CMakeLists.txt#L82)
and build it from source) ,the cmake CUDA_INCLUDE_DIR variable is
needed.

if not, you will encounter following [ build
error](https://dev.azure.com/onnxruntime/onnxruntime/_build/results?buildId=1133937&view=logs&j=7536d2cd-87d4-54fe-4891-bfbbf2741d83&t=39e3f98f-7fe5-578c-20bd-5ae5a4590bda):

CMake Error: The following variables are used in this project, but they
are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the
CMake files:
    /build/Release/_deps/onnx_tensorrt-src/CUDA_INCLUDE_DIR

Note: Not quite sure why in the past when CI still tested with oss
parser won't hit this issue. probably the CUDA_INCLUDE_DIR was defined
somewhere back then.

cmake/onnxruntime_providers.cmake

@@ -729,6 +729,7 @@ if (onnxruntime_USE_TENSORRT)
     onnxruntime_fetchcontent_makeavailable(onnx_tensorrt)
     include_directories(${onnx_tensorrt_SOURCE_DIR})
     set(CMAKE_CXX_FLAGS ${OLD_CMAKE_CXX_FLAGS})
+    set(CUDA_INCLUDE_DIR ${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES}) # onnx-tensorrt repo needs this variable to build
     if ( CMAKE_COMPILER_IS_GNUCC )
       set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -Wno-unused-parameter")
     endif()