Auto-forward to search suggestion when zero results

If the user gets zero results, but gets a "Did you mean" result, just
run the query for the "Did you mean" result and inform the user that
this happened. Adds a new query param 'runsuggestion' which will, when
given a falsy value, prevent running the suggestion and give the result
to the original query.

Bug: T105202
Change-Id: I7ed79942c242b1957d46bdcad59985f37466fb83