Make sure new search suggest features are disabled for 16.0

Upstream has been adding a bunch of search suggest features via their rust backend. We should check that these new features are all still blocked by our preferences browser.urlbar.suggest.quicksuggest.nonsponsored, browser.urlbar.suggest.quicksuggest.sponsored. Maybe adding more preferences on top:

  • Bugzilla bug 1977239: [meta] Important Dates for Firefox Suggest. Likely locale and region dependent. Maybe preference: browser.urlbar.suggest.importantDates.
  • Bugzilla bug 1967316: [meta] Suggest Online - Implement Stock Information Suggestions. Why? Maybe preference: browser.urlbar.suggest.market.
  • Bugzilla bug 1968962: [meta] Suggest Online - Implement Yelp Online Suggestions. Maybe preference: browser.urlbar.suggest.yelp and browser.urlbar.suggest.yelpRealtime.
  • Bugzilla bug 1982135: [meta] Suggest Online - Implement Flight Status Suggestions. Maybe preference: browser.urlbar.suggest.flightStatus.
  • Bugzilla bug 1967318: [meta] Suggest Online - Implement Sports Information Suggestions. Maybe preference: browser.urlbar.suggest.sports.
  • Bugzilla bug 1971879: Make AMP and Wikipedia suggestions independently toggleable from Suggest. Maybe preference browser.urlbar.suggest.wikipedia and browser.urlbar.suggest.amp.
  • Plus more that upstream is probably adding between 148 and 153.

There are also other existing suggest features from 140 or earlier. Of which, we only explicitly disable browser.urlbar.suggest.addons and browser.urlbar.suggest.weather. We should determine whether we should drop these fine-grained preferences and just rely on the higher level preferences or logic to exclude them.

See also bugzilla bug 1981979, where some suggest features may be enabled for private browsing.

/cc @donuts