Delete APPS_ZIP

This is a relic of pre-AOSP days, it's probably not used.
Not having any apps from non-system partitions or having useful files
like rros or dexpreopt files means its probably not useful in the modern
day.

Bug: 395993268
Test: Presubmits
Change-Id: I30509cc97275d06fc5e685014d3f605305b6fe46