[2/2] Add new method for determining whether to show block option

BlockRequests only work on certain data types.
Phone numbers are currently the only type supported.
It doesn't make sense to give block action to something that won't get blocked.

Ticket CD-461

Change-Id: Ic02dedb7815f2239e8bf031c1d4b1e422fca9d04
(cherry picked from commit affff689)