Disable showing user availability in autocomplete

Return nil for availability for now due to
https://gitlab.com/gitlab-org/gitlab/-/issues/28544

app/assets/javascripts/gfm_auto_complete.js

@@ -42,7 +42,7 @@ export function membersBeforeSave(members) {
       title: sanitize(title),
       search: sanitize(`${member.username} ${member.name}`),
       icon: avatarIcon,
-      availability: member.availability,
+      availability: member?.availability,
     };
   });
 }

app/services/concerns/users/participable_service.rb

@@ -46,8 +46,9 @@ module Users
         username: user.username,
         name: user.name,
         avatar_url: user.avatar_url,
-        availability: user&.status&.availability
+        availability: nil
       }
+      # Return nil for availability for now due to https://gitlab.com/gitlab-org/gitlab/-/issues/285442
     end
 
     def group_as_hash(group, group_counts)