fix: [Stateful: Home page] Missing information of Store this API key …

…section first time (elastic#198253)

Closes: elastic#195382
Closes: elastic#195366

## Description

All information which is accessible for the user should be announced
when the user navigates to the element first time (not only when he
reaches it second, third and so on time).

## What was changed?:

1. added `role="alert"` to correctly pronounce status update. Addind
role attribute also fixes elastic#195366

## Screen:

https://github.com/user-attachments/assets/3f7707e4-5cc4-451b-9e5c-372e2e7dab81
(cherry picked from commit 92ae754)

x-pack/plugins/enterprise_search/public/applications/shared/api_key/create_api_key_flyout.tsx

@@ -210,6 +210,7 @@ export const CreateApiKeyFlyout: React.FC<CreateApiKeyFlyoutProps> = ({ onClose
                   defaultMessage: 'Store this API key',
                 })}
                 titleSize="xs"
+                role="alert"
               >
                 <EuiText>
                   {i18n.translate('xpack.enterpriseSearch.apiKey.apiKeyStepDescription', {