Reapply "Extract archive in different location"

This reverts commit 59e24e4.

Author: mc-nv

cmake/download_onnxruntime.cmake

@@ -1,7 +1,7 @@
 if(DEFINED TRITON_ONNXRUNTIME_PACKAGE_URL)
 
   set(DOWNLOAD_PATH "${CMAKE_BINARY_DIR}/_deps/downloads/onnxruntime.zip")
-  set(EXTRACT_DIR "${CMAKE_BINARY_DIR}/_deps/downloads/onnxruntime")
+  set(EXTRACT_DIR "${CMAKE_BINARY_DIR}/onnxruntime")
 
   message(NOTICE "Downloading onnxruntime: ${TRITON_ONNXRUNTIME_PACKAGE_URL}")