pub fn custom_cgroup_add_midrun(ctx: &Ctx<'_>) -> Result<AssertResult>Expand description
Add up to two cgroups mid-run alongside two steady cgroups.
cg_0 and cg_1 run for the whole scenario; cg_2 / cg_3
appear mid-run as a step-local CgroupDef set and tear down at
the step boundary. Steady cgroups go on the Backdrop;
mid-run additions stay step-local.