tests: fix and update tests:

- update code to newer version of `sh`
- update code to newer version of `selenium`
- update names of OMEMO algorithms
- fix paths and names used to mount source to the test container
- skip modules using `Gst` and `PyQt` when they are not available.

tests/e2e/libervia-cli/conftest.py

@@ -38,7 +38,7 @@ class LiberviaCliJson:
         kwargs['output'] = 'json-raw'
         kwargs['_tty_out'] = False
         cmd = li(*args, **kwargs)
-        return json.loads(cmd.stdout)
+        return json.loads(cmd)
 
     def __getattr__(self, name):
         if name.startswith('_'):
@@ -63,7 +63,7 @@ class LiberviaCliElt(LiberviaCliJson):
         kwargs['output'] = 'xml-raw'
         kwargs['_tty_out'] = False
         cmd = li(*args, **kwargs)
-        return self.parser(cmd.stdout.decode().strip())
+        return self.parser(cmd.strip())
 
 
 class Editor: