This does the following:
* Get rid of `QUICK_SUGGEST_SOURCE` since it's only used in a couple of
places. Its simpler to use the string literals directly.
* Set `source: "merino"` on Merino suggesions in the Merino client instead of
doing it in UrlbarProviderQuickSuggest, similar to how the remote settings
client sets `source: "remote-settings"`
* Export `ONBOARDING_CHOICE` and `ONBOARDING_URI` on the QuickSuggest object for
consistency with other consts
* Remove unnecessary consts from QuickSuggestTestUtils that are already defined
on QuickSuggest
Please see bug 1798595 for details.
Depends on D160986
Differential Revision: https://phabricator.services.mozilla.com/D160987
be65e71e30
