Disable etw exporter

tools/run_tests/helper_scripts/build_cxx.bat

@@ -64,7 +64,7 @@ If "%GRPC_CMAKE_GENERATOR%" == "Ninja" (
   cd third_party/opentelemetry-cpp
   mkdir build
   cd build
-  cmake -G "%GRPC_CMAKE_GENERATOR%" -DCMAKE_C_COMPILER="cl.exe" -DCMAKE_CXX_COMPILER="cl.exe" -DWITH_ABSEIL=ON -DBUILD_TESTING=OFF -DWITH_BENCHMARK=OFF -DCMAKE_BUILD_TYPE="%MSBUILD_CONFIG%" -DCMAKE_INSTALL_PREFIX="%INSTALL_PATH%" %* ..  || goto :error
+  cmake -G "%GRPC_CMAKE_GENERATOR%" -DCMAKE_C_COMPILER="cl.exe" -DCMAKE_CXX_COMPILER="cl.exe" -DWITH_ABSEIL=ON -DBUILD_TESTING=OFF -DWITH_BENCHMARK=OFF -DWITH_ETW=OFF -DCMAKE_BUILD_TYPE="%MSBUILD_CONFIG%" -DCMAKE_INSTALL_PREFIX="%INSTALL_PATH%" %* ..  || goto :error
   ninja -j%GRPC_RUN_TESTS_JOBS% install || goto :error
 
   cd ../../..
@@ -93,7 +93,7 @@ If "%GRPC_CMAKE_GENERATOR%" == "Ninja" (
   cd third_party/opentelemetry-cpp
   mkdir build
   cd build
-  cmake -G "%GRPC_CMAKE_GENERATOR%" -A "%GRPC_CMAKE_ARCHITECTURE%" %CMAKE_SYSTEM_VERSION_ARG% -DCMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE=x64 -DWITH_ABSEIL=ON -DBUILD_TESTING=OFF -DWITH_BENCHMARK=OFF -DCMAKE_INSTALL_PREFIX="%INSTALL_PATH%" %* .. || goto :error
+  cmake -G "%GRPC_CMAKE_GENERATOR%" -A "%GRPC_CMAKE_ARCHITECTURE%" %CMAKE_SYSTEM_VERSION_ARG% -DCMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE=x64 -DWITH_ABSEIL=ON -DBUILD_TESTING=OFF -DWITH_BENCHMARK=OFF -DWITH_ETW=OFF -DCMAKE_INSTALL_PREFIX="%INSTALL_PATH%" %* .. || goto :error
   cmake --build . --target install -j%GRPC_RUN_TESTS_JOBS% || goto :error
 
   cd ../../..