fix: remove unnecessary wakes

[akundaz]

Remove these calls in the pipeline executor:

cx.waker().wake_by_ref();

This line tells the tokio executor to immediately poll the same future again, but since the cursor is not ready to advance yet, we end up going to that wake line very quickly because we don't do anything. This causes a hot loop in the tokio executor leading to heavy context switching.

[julio4]

Nice good find on this hot reschedule loop! Just one issue that should fix tests as well and should be good to go

[julio4]

Suggested change

	executor.cursor = Cursor::StepInProgress(path, future);
	executor.cursor = Cursor::StepInProgress(path, future);
	cx.waker().wake_by_ref();

This wake is necessary because we have a new future/at a state transition boundary and directly return Poll::Pending without polling it first, so there would be no registered waker to drive progress without it.