Revert "Revert^2 "VanillaIceCream/35 is now REL""

This reverts commit ae81cabee5c8e0dfce6e58c4b5deca72704ba6dc.

Remove the temporary hack from the package manager that allows apps
build against a preview SDK to be installed on a REL platform.

Bug: 340822159
Test: presubmit
Change-Id: I9ddde3758b2f6ec63c8012e30ffc8c58fa34f4e9
2 files changed