[test][loop_executor] Fix sequential loop user test

Now requires a sequential loop algorithm.
2 jobs for loop_read_sequentially_input in 11 minutes and 15 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Build
passed #169850
docker
build_linux_36

00:04:13

73.0%
passed #169851
macosx
build_macosx_36

00:11:15

73.0%