[ADI][50/N] move developer verification into installation fragment

+ Also move the strings to strings_v2.xml
+ Also removes the last installation failure dialog as per UX
  requirement

BUG: 360129657
FLAG: android.content.pm.verification_service
Test: manual

Change-Id: Ib82b8bd2d745a2a2ef4f75b7ae8032e97d6297d3