twai: Temporarily disable network example test

Disabling network example test due to issue with synchronizing the
start of each DUT

examples/peripherals/can/can_network/example_test.py

@@ -36,7 +36,7 @@ def dut_thread_callback(**kwargs):
     result[0] = True
 
 
-@IDF.idf_example_test(env_tag='Example_CAN2')
+@IDF.idf_example_test(env_tag='Example_CAN2', ignore=True)
 def test_can_network_example(env, extra_data):
 
     # Get device under test. "dut1", "dut2", and "dut3" must be properly defined in EnvConfig