[examples] Fix memory leak in C++ controller command examples #6306
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Fixes #6258
I also added tests to prevent something like this happening again. Strangely, when I was running locally, I couldn't get the swerve controller example to fail- Only the mecanum controller and ramsete examples would fail. Given the non-determinism associated with memory errors, it probably isn't that important (especially since the swerve controller example can clearly fail), but I thought I'd mention it.