Fix only kill current user proc while clear data

While clearApplicationUserData for a specified user, only the processes under that user should be killed

Test: manual
  1.create a new user
  2.launch appA under user 0
  3.launch appA under the newly created user
  4.clear appA's user data within user_new
  5.ensure appA is not killed in user 0

Bug: 414516353
FLAG: EXEMPT bug fix
Change-Id: I5a004c52aaac5b16ccda137a3c007d53ac470fd6