[examples] Fix some smoke test path snafus

RobotLocomotion / drake

Model-based design and verification for robotics.

https://drake.mit.edu

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[examples] Fix some smoke test path snafus #21452

Closed jwnimmer-tri closed 1 month ago

jwnimmer-tri commented 1 month ago

Hard-coding paths to runfiles is incompatible with bzlmod. We should always use python.runfiles, or (in the case of acrobot) just use our simple add_test_rule pattern.

Towards #20731.

This change is

jwnimmer-tri commented 1 month ago

+@ggould-tri for both reviews, please. No hurry.