Copilot: Allow user to disable Copilot

Fixes: QTCREATORBUG-29179
Change-Id: I274de1f13f773fb61b376643b61056b6f14dabaf
Reviewed-by: BogDan Vatra <bogdan@kdab.com>
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/copilot/copilotclient.h

@@ -46,6 +46,10 @@ public:
         const QString &userCode,
         std::function<void(const SignInConfirmRequest::Response &response)> callback);
 
+    bool canOpenProject(ProjectExplorer::Project *project) override;
+
+    bool isEnabled(ProjectExplorer::Project *project);
+
 private:
     QMap<TextEditor::TextEditorWidget *, GetCompletionRequest> m_runningRequests;
     struct ScheduleData