Advance RELEASE_R8_FULL_MODE_BY_DEFAULT to true in trunk_staging

This commit was automatically created by a workflow in Gantry:
https://releasetracker.partner.android.com/changes/cri0qma000001?stage_id=1vbm8uq000001

Flag: RELEASE_R8_FULL_MODE_BY_DEFAULT
Ignore-AOSP-First: Flag change added internally for future AOSP release
Workflow-User: jdduke@google.com
Bug: 215530220
Change-Id: I7c491ef613e79ded6588b1a1c2a0983124ecc544
1 file changed