fix(FR-1680): redirect from the root page to the start page is not working (#4642)

resolves #4641 (FR-1680)

This PR removes the Import & Run page and its corresponding menu item from the WebUI. The changes include:

1. Removing the `ImportAndRunPage.tsx` component
2. Removing the `import` menu key from the `MenuKeys` type
3. Removing the Import & Run menu item from the sidebar
4. Removing the `BAIExampleStartIcon` import that was only used for this page
5. Adding a redirect to the start page when the current page is 'start'

**Checklist:** (if applicable)

- [ ] Documentation
- [ ] Minium required manager version
- [ ] Specific setting for review (eg., KB link, endpoint or how to setup)
- [ ] Minimum requirements to check during review
- [ ] Test case(s) to demonstrate the difference of before/after

Author: nowgnuesLee

react/src/components/MainLayout/WebUISider.tsx

@@ -41,7 +41,6 @@ import { MenuItemType } from 'antd/lib/menu/interface';
 import {
   filterOutEmpty,
   BAIEndpointsIcon,
-  BAIExampleStartIcon,
   BAIModelStoreIcon,
   BAIMyEnvironmentsIcon,
   BAIPipelinesIcon,
@@ -93,7 +92,6 @@ export type MenuKeys =
   | 'model-store'
   | 'ai-agent'
   | 'chat'
-  | 'import'
   | 'data'
   | 'my-environment'
   | 'agent-summary'
@@ -208,12 +206,6 @@ const WebUISider: React.FC<WebUISiderProps> = (props) => {
       key: 'chat',
       group: 'playground',
     },
-    {
-      label: <WebUILink to="/import">{t('webui.menu.Import&Run')}</WebUILink>,
-      icon: <BAIExampleStartIcon style={{ color: token.colorPrimary }} />,
-      key: 'import',
-      group: 'workload',
-    },
     {
       label: <WebUILink to="/data">{t('webui.menu.Data')}</WebUILink>,
       icon: <CloudUploadOutlined style={{ color: token.colorPrimary }} />,

react/src/pages/ImportAndRunPage.tsx

@@ -655,6 +655,13 @@ export default class BackendAIWebUI extends connect(store)(LitElement) {
       this._page = 'error';
       this._moveTo('/error');
     }
+    // since we need to add search params, redirect to the start page after error validation
+    // if you move this block to the previous error-validation block, it may cause an error
+    if (this._page === 'start') {
+      const url = new URL(window.location.href);
+      const hasSearchParam = url.search.length > 0;
+      this._moveTo(hasSearchParam ? `/start${url.search}` : '/start');
+    }
   }
 
   showUpdateNotifier(): void {