Update playwright config and refactor billing error pages

An environment variable has been added to playwright config for running the server command. On billing error pages, an icon was added to the error message, and the duplicate billing error page was refactored to import from the existing page instead of maintaining separate code. Also, changes were made to the workflow to reflect new Playwright server command.

apps/web/app/(dashboard)/home/[account]/billing/error.tsx

@@ -2,6 +2,8 @@
 
 import { useRouter } from 'next/navigation';
 
+import { ExclamationTriangleIcon } from '@radix-ui/react-icons';
+
 import { Alert, AlertDescription, AlertTitle } from '@kit/ui/alert';
 import { Button } from '@kit/ui/button';
 import { PageBody, PageHeader } from '@kit/ui/page';
@@ -20,6 +22,8 @@ export default function BillingErrorPage() {
       <PageBody>
         <div className={'flex flex-col space-y-4'}>
           <Alert variant={'destructive'}>
+            <ExclamationTriangleIcon className={'h-4'} />
+
             <AlertTitle>
               <Trans i18nKey={'billing:planPickerAlertErrorTitle'} />
             </AlertTitle>