Revert "tests: try to fix test failures due to stale files"

This reverts commit 5a768f7f169e49b76c33fa5210297ce5f79aed70.

The dashboard machines are cleaned up, no need to keep this around.
Merge topic 'MemChecker-improvements' into next

85cd4c2 Revert "tests: try to fix test failures due to stale files"