[tools] Fix buildifier_test to not scribble in runfiles

RobotLocomotion / drake

Model-based design and verification for robotics.

https://drake.mit.edu

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Closed jwnimmer-tri closed 1 month ago

jwnimmer-tri commented 1 month ago

Unit tests should never write to cwd, rather always to TEST_TMPDIR.

Towards #20731.

This change is

jwnimmer-tri commented 1 month ago

+@rpoyner-tri for both reviews, please.