Add an upsell dialog to activate the storage manager.

After a manual clear, the user will be prompted to turn
on the storage manager, if it is turned off. The prompt
will only show up after certain defined delay times and
stop showing up entirely if denied enough times.

Currently, the dialog does not actually turn on the storage
manager because the storage manager is not yet landed.

Bug: 28801159

Change-Id: I3c221786d08a7102b3b5357416ab12692d1894cf