[MM-61508] Fixed errcheck issues in upload_test.go, [MM-61510] Fixed errcheck issues in user_test.go (#29308)

server/.golangci.yml

@@ -119,8 +119,6 @@ issues:
         channels/app/team.go|\
         channels/app/team_test.go|\
         channels/app/upload.go|\
-        channels/app/upload_test.go|\
-        channels/app/user_test.go|\
         channels/app/web_broadcast_hooks_test.go|\
         channels/app/webhook_test.go|\
         channels/jobs/batch_worker_test.go|\