* Add a new block ping. I called it "block" to be consistent with internal
naming in urlbar/quick suggest, but let me know if you'd prefer "dismiss"
* Add a `iab_category` property to suggestion objects returned from
UrlbarQuickSuggest (i.e., remote settings. Merino will separately need to
include this in its suggestions too)
* Add a new `sponsoredIabCategory` payload property to quick suggest results so
we can record `iab_category` in the ping
* Modify existing tests to include `iab_category` in mock sponsored suggestions
and `sponsoredIabCategory` in the expected payloads
* Replace the several QuickSuggestTestUtils functions for checking pings with a
single function that makes sure only the specified pings are recorded and
nothing more
Depends on D143331
Differential Revision: https://phabricator.services.mozilla.com/D143674
5ff4150738