CC list needs to be contained in notify_details. We
can not use --param, because it is a map of recipient
type to NotifyInfo entity. '--param' can not accept a dict
from command line.

BUG=NA
TEST=gpaste/4774055988166656

Change-Id: I1560fe3a6136ab431052bc3fee7d4c8d989c8579
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3438508Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Xinan Lin <linxinan@chromium.org>