Rename IME Switcher Menu items after cleanup

This removes the "new" suffix for the IME Switcher Menu controller and
related resources. This is a follow up of [1].

  [1]: I2c08e3f17abd09fa59df0648f65cb02c2e0194a2

Flag: EXEMPT cleanup
Bug: 281029564
Test: atest InputMethodInfoTest
  InputMethodMenuControllerTest
  InputMethodServiceTest
  InputMethodSubtypeSwitchingControllerTest
  InputMethodManagerTest
  InputMethodSubtypeTest
  TaskbarNavButtonControllerTest
Change-Id: I3e31ee393f88dc7f5f63427803d863bc38a33938