Merge "Merge "Load widget preview images before adding the rows to the adapter" into sc-dev am: dd19a24769 am: 23cbe6ef6b" into sc-v2-dev-plus-aosp am: 5532b303ef

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14965044

Change-Id: Ice3f9847f7b4d9e3d53d9755187b3e985bf77fbc