Remove CA dir in ENV/PROXY stage 2
This means that the CA files are deleted on the worker node, which is more efficient than A-REX deleting them from the session dir, which can cause A-REX to slow down when the session dir is on a slow file system.
This means that the CA files are deleted on the worker node, which is more efficient than A-REX deleting them from the session dir, which can cause A-REX to slow down when the session dir is on a slow file system.