Most gate jobs include Selenium tests, which take upwards from half an hour to run, and generate noise by failing randomly (see T224673 for some older data). They should be removed or made non-voting in contexts where they are less valuable, just like it was done for non-gate jobs (T225248). The prime candidate is wmf branches: only backports of known-good patches happen here, so the chance of a selenium test catching a real error is exceedingly small, but the gate jobs are time-sensitive (backports need to be merged during one-hour deploy windows), so these tests hamper our ability to backport patches as needed.