Revert "Revert "Move apex sessions directory to /metadata""

This reverts commit 7645e253a16b7874cc7d4736dfecec24e411abb1.

Reason for revert: Could not repro error locally, will run Forrest tests to see if error persists

Change-Id: Ic328d3987d9ada1f5e96db33a131f376047b0f99
12 files changed