Search UI: redirect to browse page if input matches an archived origin URL

When a user enters the exact URL of an origin archived by Software Heritage, he should be immediately redirected to the browse UI of the origin instead of displaying a list of search results.

We could add a processing similar to what we do when a SWHID is entered in the search input, except in that case we should check if input text looks like a valid URL. If it is we can do a lookup of the origin URL using the Web API and redirect to browse page if the origin is found.

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Migrated from T3354 (view on Phabricator)