Disable "test_strict_interfaces"

The "strict" test jobs are currently disabled, except for
"test_strict_interfaces", which is now failing.

We'll disable this test as well until we get to fix the "strict"
channel, which is currently low-prio.

tests/integration/tests/test_strict_interfaces.py

@@ -17,6 +17,8 @@
 )
 @pytest.mark.tags(tags.WEEKLY)
 def test_strict_interfaces(instances: List[harness.Instance], tmp_path):
+    pytest.xfail("Strict channel tests are currently skipped.")
+
     channels = config.STRICT_INTERFACE_CHANNELS
     cp = instances[0]
     current_channel = channels[0]