[MM-62996] Add focusability to react-select remove button in notifications settings (#31238)

* [MM-62996] Fix the readout for react-select instructions on user_settings_notifications

* Update webapp/channels/src/components/user_settings/notifications/user_settings_notifications.tsx

Co-authored-by: Harrison Healey <harrisonmhealey@gmail.com>

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: Harrison Healey <harrisonmhealey@gmail.com>

webapp/channels/src/components/user_settings/notifications/user_settings_notifications.tsx

@@ -231,7 +231,6 @@ function getDefaultStateFromProps(props: Props): State {
 const Input = (props: InputProps<MultiInputValue, true>) => {
     const ariaProps = {
         'aria-labelledby': 'settingTitle',
-        'aria-describedby': 'extraInfo',
     };
 
     return (