Don't close CPC belonging to overall Job.

The parent Job is managing the lifecycle of the CPC object, so we
shouldn't be using try-with-resources internally.  Otherwise, we
risk closing the CPC before other parts of the job are finished.

Test: atest DocumentsUITests
Bug: 65577524
Change-Id: I4bb224908f47e84eb3eeda0d26e60803ab264b06