exec/java DriverHandle.Exec methods should be run by executor

[schmichael]

As part of #2478 a new Exec method was added to DriverHandles for executing script checks inside a task's context. The initial PR #2467 chroot'd commands run via Exec but didn't apply cgroups or any of the other environment's properties.

exec/java should execute scripts through the executor so they run in the same environment as the task.

raw_exec should probably follow the same path to ensure it's run in the same environment as its command. If nothing else the execChroot helper function will need refactoring and renaming once exec/java don't use it.

[github-actions]

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