fix(editor): Trial banner does not disappear after sign out (no-changelog) (#6930)

to test in staging use version
`PR-6930-ado-990-trial-banner-does-not-disappear-after-sign-out`

<img width="875" alt="image"
src="https://github.com/n8n-io/n8n/assets/16496553/dfffe60f-bec3-4c48-bd9c-5990c68afa52">

cypress/pages/bannerStack.ts

@@ -0,0 +1,8 @@
+import { BasePage } from './base';
+
+export class BannerStack extends BasePage {
+	getters = {
+		banner: () => cy.getByTestId('banner-stack'),
+	};
+	actions = {};
+}

cypress/pages/index.ts

@@ -7,3 +7,4 @@ export * from './settings-users';
 export * from './settings-log-streaming';
 export * from './sidebar';
 export * from './ndv';
+export * from './bannerStack';

cypress/pages/sidebar/main-sidebar.ts

@@ -1,4 +1,5 @@
 import { BasePage } from '../base';
+import { WorkflowsPage } from '../workflows';
 
 export class MainSidebar extends BasePage {
 	getters = {
@@ -9,7 +10,7 @@ export class MainSidebar extends BasePage {
 		workflows: () => this.getters.menuItem('Workflows'),
 		credentials: () => this.getters.menuItem('Credentials'),
 		executions: () => this.getters.menuItem('Executions'),
-		userMenu: () => cy.getByTestId('main-sidebar-user-menu'),
+		userMenu: () => cy.get('div[class="action-dropdown-container"]'),
 	};
 	actions = {
 		goToSettings: () => {
@@ -26,5 +27,15 @@ export class MainSidebar extends BasePage {
 		openUserMenu: () => {
 			this.getters.userMenu().find('[role="button"]').last().click();
 		},
+		openUserMenu: () => {
+			this.getters.userMenu().click();
+		},
+		signout: () => {
+			const workflowsPage = new WorkflowsPage();
+			cy.visit(workflowsPage.url);
+			this.actions.openUserMenu();
+			cy.getByTestId('user-menu-item-logout').click();
+			cy.wrap(Cypress.session.clearAllSavedSessions());
+		},
 	};
 }