Launch the new TopLevelSettings for all settings tab.

The new TopLevelSettings page uses a standard DashboardFragment to host
all top level settings. It's easier to maintain than DashboardSummary.

It does not support conditional cards or suggestion cards. We will use
PersonalSettingsFragment to host these as contextual cards going
forward.

Bug: 110405144
Test: visual
Change-Id: I2ab2d3556e870e86ebc18f9876336c4a3a361897