Merge "[Search] Support flexible results-per-row in AllApps" into sc-dev am: 3b61fb2b01

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13786390

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2423c1f4f761d926aaf614a1c556a4adc1b3ec21