Handle refinement responses on the main thread. am: 622b5d33df am: 915fc26805

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/IntentResolver/+/21478208

Change-Id: Id7c3821c5ec1ddf810921c44910533b3b61078c6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>