feat: add external link icon to organization admin API menu item (#23538)

- Add isExternalLink: true property to admin_api menu item in organization settings
- Matches the same pattern used by the members page external link icon
- Leverages existing VerticalTabItem component support for external link icons

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/web/app/(use-page-wrapper)/settings/(settings-layout)/SettingsLayoutAppDirClient.tsx

@@ -117,6 +117,7 @@ const getTabs = (orgBranding: OrganizationBranding | null) => {
         {
           name: "admin_api",
           href: "https://cal.com/docs/enterprise-features/api/api-reference/bookings#admin-access",
+          isExternalLink: true,
         },
       ],
     },