Skip the Cloud page if the user is logged in

If the user goes through the welcome wizard, arrives at the login page,
logs in and then closes Cura, he/she will be logged in the next time.
In this case, he/she will go through the welcome page again but will
not see the sign in page at all.

CURA-7019

cura/UI/WelcomePagesModel.py

@@ -245,6 +245,7 @@ class WelcomePagesModel(ListModel):
                            },
                           {"id": "cloud",
                            "page_url": self._getBuiltinWelcomePagePath("CloudContent.qml"),
+                           "should_show_function": self.shouldShowCloudPage,
                            },
                           {"id": "add_network_or_local_printer",
                            "page_url": self._getBuiltinWelcomePagePath("AddNetworkOrLocalPrinterContent.qml"),
@@ -286,6 +287,17 @@ class WelcomePagesModel(ListModel):
         first_start_actions = self._application.getMachineActionManager().getFirstStartActions(definition_id)
         return len([action for action in first_start_actions if action.needsUserInteraction()]) > 0
 
+    def shouldShowCloudPage(self) -> bool:
+        """
+        The cloud page should be shown only if the user is not logged in
+
+        :return: True if the user is not logged in, False if he/she is
+        """
+        # Import CuraApplication locally or else it fails
+        from cura.CuraApplication import CuraApplication
+        api = CuraApplication.getInstance().getCuraAPI()
+        return not api.account.isLoggedIn
+
     def addPage(self) -> None:
         pass