Fix package parsing equivalence test comparisons

If an APK is skipped because of a failure in v2, but succeeds
in v1, both variants need to be ignored since there's nothing
to compare when one side fails.

This also updates SystemPartitionParseTest to support
compressed packages, decompressing them to a temporary file
for parsing.

Bug: 159806243

Test: atest com.android.server.pm.parsing

Change-Id: I93faee0f0dc6ba33bb977ad947ed6c07c0a06395