[MM-61778] Fix errcheck issues in web_hub_test.go (#30676)

Co-authored-by: Claude <noreply@anthropic.com>

server/.golangci.yml

@@ -98,7 +98,6 @@ issues:
         channels/app/platform/license.go|\
         channels/app/platform/session.go|\
         channels/app/platform/status.go|\
-        channels/app/platform/web_hub_test.go|\
         channels/app/slashcommands/command_test.go|\
         channels/app/slashcommands/helper_test.go|\
         channels/app/team_test.go|\