Updated dashboard.py and DashboardConfigurationStore.js

- Added `session.clear()` to clean the session specific to each login session
- Clear all cookie with the `signout` request and also clear again (just in case) in the frontend code.

src/static/app/src/stores/DashboardConfigurationStore.js

@@ -63,8 +63,9 @@ export const DashboardConfigurationStore = defineStore('DashboardConfigurationSt
 			});
 		},
 		async signOut(){
-			await fetchGet("/api/signout", {}, (res) => {
+			await fetchGet("/api/signout", {}, () => {
 				this.removeActiveCrossServer();
+				document.cookie = '';
 				this.$router.go('/signin')
 			});
 		},