[test][test_commands] legends option replaced by titles option for histograms

8 jobs for metrics in 12 minutes and 16 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #140985
docker
build_linux_27

00:12:09

89.0%
passed #140986
docker
build_linux_36

00:12:09

89.0%
passed #140987
macosx
build_macosx_27

00:10:51

89.0%
passed #140988
macosx
build_macosx_36

00:10:25

89.0%
canceled #140896
docker
build_linux_27

00:00:34

canceled #140897
docker
build_linux_36

00:00:34

canceled #140898
macosx
build_macosx_27

00:00:41

canceled #140899
macosx
build_macosx_36

00:00:41