Protect instant apps from full apps

Bug: 35871369
Test: cts-tradefed run commandAndExit cts-dev -m CtsAppSecurityHostTestCases -t android.appsecurity.cts.EphemeralTest
Test: Manual; install instant app and ensure it runs
Change-Id: I1835fe58256377f901db38fcc3e4c98886d799ac
Merged-In: I1835fe58256377f901db38fcc3e4c98886d799ac