[test][prefix] Change loop channel dataformats to improve testing

2 jobs for new_loop_user_types in 15 minutes and 55 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #169150
docker-build
build_linux_36

00:15:00

64.0%
passed #169151
macosx
build_macosx_36

00:15:55

64.0%