Hide IME Switcher settings during setup flow

This starts taking into account whether the user is currently in the
setup flow when determining whether the IME Switcher menu settings
button should be visible.

Flag: EXEMPT bugfix
Test: atest
  InputMethodManagerTest#testInputMethodPickerOpenLanguageSettings
  InputMethodManagerTest#testInputMethodPickerNoLanguageSettingsWhenDeviceNotProvisioned
Bug: 361526868
Change-Id: Ic472201599516c65c27dafc4476cd85d83ac8fac