Redirect to the browse origin page when the user searchs for an exact, already archived URL
When the user searches with a valid, archived URL, it makes more sense to redirect directly to the browse page rather than showing search results. Two generic functions added are 'isValidURL' and 'isArchivedOrigin'. First one returns a boolean whereas the latter returns a promise.
Related to #3354 (closed)
Migrated from D5828 (view on Phabricator)