Revert "Enable FASS assertions for IME Appear"

Revert "Add IME Appear assertions for FASS and tests"

Revert submission 16047871-fass-ime-appear

Bug: b/203658051

Reason for revert: It breaks the tests b/203658051
Reverted Changes:
I018c657f1:Enable FASS assertions for IME Appear
Iab7f373de:Add IME Appear assertions for FASS and tests

Change-Id: I8f30b76ed6de035a84f3faf70441a7f7e9001b43