Mark Sosivio test as xfail

Sosivio seems to be abandoned, there's no Github activity and the
website is down [1][2].

The helm registry is also down[3], which is currently blocking the
Microk8s CI.

That being considered, we'll skip the Sosivio test, marking it as
xfail (expected fail).

[1] https://github.com/Sosivio
[2] https://docs.sosiv.io/
[3] https://helm.sosiv.io/

Author: petrutlucian94

tests/test_sosivio.py

@@ -28,6 +28,8 @@ def test_sosivio(self):
         """
         Sets up and validates Sosivio.
         """
+        pytest.xfail("The Sosivio test is currently failing as https://helm.sosiv.io is down.")
+
         print("Enabling sosivio")
         microk8s_enable("sosivio")
         print("Validating sosivio")