Fix security vulnerability issue for multi user call redirections.

Currently we won't check if the PhoneAccountHandle provided by a
CallRedirectionService has multi-user capability or belong to the same
user as the current user. Add the check and disconnect the call if this
is an unexpected cross-user call redirection.

Bug: 235098883
Test: CallsManagerTest, manual test with test app provided in
b/235098883.

Change-Id: Ia8b9468aa2bb8e3157c227e2617ff6a52e0af119