Isolate app profile ref data

Due to aosp/1708274, ref data directory is now world accessible.
We need to fix ref data directory so that it does not leak app
visibility information.

Bug: 189787375
Test: AppDataIsolationTests
Merged-In: I716852478ce0734c7038934c88c36a567c06393f
Change-Id: I351fd9763c4bdb6d3c0c9a9047de9a4f9986bd03