Cleaning up some enabled features

Bug: 270394468
Bug: 270393900
Bug: 270390907
Bug: 270390930
Bug: 270390937
Bug: 270391693
Bug: 270391638
Bug: 270395177
Bug: 270395269
Flag: EXEMPT legacy flags cleanup
        ENABLE_SHOW_KEYBOARD_OPTION_IN_ALL_APPS
        ENABLE_ALL_APPS_SEARCH_IN_TASKBAR
        ENABLE_DEVICE_SEARCH
        ENABLE_HIDE_HEADER
        ENABLE_TWOLINE_ALLAPPS
        IME_STICKY_SNACKBAR_EDU
        FOLDER_NAME_MAJORITY_RANKING
        SCROLL_TOP_TO_RESET
        ENABLE_SEARCH_UNINSTALLED_APPS
        ENABLE_HOME_TRANSITION_LISTENER

Test: Presubmit
Change-Id: Ia392c10fc65616405cc4d4a2b8ed566e3bb7d386