Add LaunchHandler to the field trial config

Enable launch_handler and file_handlers for android in the field trial
config

Change-Id: Ife5c0d8b56edd545bac6ef6ce1c77067eb33ed90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6574723
Reviewed-by: Serhii Selyvon <sselyvon@google.com>
Reviewed-by: Bartosz Chomiński <chominskib@google.com>
Reviewed-by: Vlad Korotkevich <vkorotkevich@google.com>
Commit-Queue: Serhii Selyvon <sselyvon@google.com>
Cr-Commit-Position: refs/heads/main@{#1463419}