Add not supporting multi-instance toast to more entering split flows

Bug: 260389099
Bug: 260932325
Test: verified toast message when launching the same component
      adjacently.
Video: http://recall/-/fLARJNt42LVxc3tt86SneW/c2smEZrejaZfq197CKEqs7
       http://recall/-/fLARJNt42LVxc3tt86SneW/YxQdpCBHaQPZ62cMSkAZU
Change-Id: Ic2800349e079cd29c81ccc53ebfcc548b7c24f30