Debug some failed tests from test_xcpp_kernel.py on Windows CI & enable them

[anutosh491]

Currently few tests from test_xcpp_kernel.py fail while running tests through the windows CI (hence the test are not enabled for the same).

Mentioning them here too

C:\Users\runneradmin\micromamba-root\envs\xeus-cpp\Lib\site-packages\jupyter_client\channels.py:233: Empty
=========================== short test summary info ===========================
FAILED test_xcpp_kernel.py::XCppTests::test_display_data - _queue.Empty
FAILED test_xcpp_kernel.py::XCppTests::test_execute_stderr - _queue.Empty
FAILED test_xcpp_kernel.py::XCppTests::test_execute_stdout - _queue.Empty
FAILED test_xcpp_kernel.py::XCppTests::test_kernel_info - _queue.Empty
============= 4 failed, 8 skipped, 20 rerun in 367.71s (0:06:07) ==============

[mcbarton]

@anutosh491 What is the difference between this issue and #9 ?

[anutosh491]

Duplication of #9 hence closing