Do not cause 'Exception ignored' warnings upon termination when sys was destroyed before WorkerManager.
Do not cause 'Exception ignored' warnings upon termination when sys was destroyed before WorkerManager.

PiperOrigin-RevId: 426136814
Change-Id: Id0e17ebdd9112ce513771f58fee42690e00cf360

deepmind/launchpad,deepmind/launchpad,deepmind/launchpad,deepmind/launchpad