Fix an exception while scanning apex packages

Package parser throws an exception while it's in the onlyCoreApp
state and parsing an non-core app. Catching the parser exception
during scanning apex packages, if the apex is without coreApp
attribute and device is in minimal boot state.

Also, updates package parser to V2 for the staging manager.

Bug: 151296698
Test: atest ApexManagerTest
Test: atest StagedInstallTest
Change-Id: I098e08d4064812465a29086c3fde1a55348bcae5