[Provider Model] Adjust the design of "See all" (QS Internet Dialog)

- Show "See all" until there are results && there are more results than
can fit into the panel.

- See b/206061768#comment22 for a screenshot.

Bug: 206061768
Test: manual test
atest -c InternetDialogControllerTest \
         InternetDialogTest

Change-Id: If58364d865ea4497ea270fddbe8ba409f6069391