ChasmTest heisentest

[PJB3005]

Description

Test seems to fail sporadically, e.g. https://github.com/space-wizards/RobustToolbox/actions/runs/17834411483/job/50707762633

[slarticodefast]

Ok, I think I figured the reason out.

Sometimes walking into the grapple can push you up or down.

And chasms use StepTriggers which only activate when the fixtures have a certain overlap.

A few ways to solve this, either add two more chasms to the top and bottom, make the player not collide with the grapple, increase the sensitivity for the step trigger etc.
I'll do some testing and make a PR.