Build a way to decide card width

Slice cards in contextual homepage are shown as half card or full card.
We will use Category field of ContextualCard to decide card width.

In this CL, also fixed the problem of not showing full card after a
consecutive suggestion card dismissal.

Bug: 119655434
Bug: 121315057
Test: visual, robotest
Change-Id: I3243b9db21b8f288cab88238b20d7d50a2a20d46