fix(ui): duplicate basePath in Logout Button Link (#11432)

This PR resolves an issue where the `href` for the Logout button in the
admin panel included duplicate `basePath` values when `basePath` was set
in `next.config.js`.

The Logout button was recently updated to use `NextLink` (`next/link`),
which automatically applies the `basePath` from the Next.js
configuration. As a result, manually adding the `basePath` to the `href`
is no longer necessary.

Relevant PRs that modified this behavior originally: 
- #9275
- #11155

packages/ui/src/elements/Logout/index.tsx

@@ -28,8 +28,6 @@ export const Logout: React.FC<{
     routes: { admin: adminRoute },
   } = config
 
-  const basePath = process.env.NEXT_BASE_PATH ?? ''
-
   const props = {
     'aria-label': t('authentication:logOut'),
     className: `${baseClass}__log-out`,
@@ -43,7 +41,6 @@ export const Logout: React.FC<{
       {...props}
       href={formatAdminURL({
         adminRoute,
-        basePath,
         path: logoutRoute,
       })}
     >