Flake on pytest df instance that times-out after 5seconds instead of properly shut down

[kostasrim]

This happen from time to time in our regression tests. Maybe it's worth looking on why: https://github.com/dragonflydb/dragonfly/actions/runs/7923846274

(not critical happens rarely)

[romange]

Fiber "Dispatched" looks suspicious: https://github.com/dragonflydb/dragonfly/actions/runs/7923846274/job/21634391807#step:6:1521

This is the default name of a fiber that is run via ProactorBase::Dispatch method. This seems to be called only via RunBlockingInParallel function or inside load_join_fiber. The first step would be to go over all the cases there and override the fiber name with a specific name using ThisFiber::SetName function at the beginning of each fiber function.