Allow for archived results in `deb` searches

Numerous users complain about not seeing previous versions of deb packages. This impacts artefact review, because sometimes an artefact is automatically archived before being reviewed, and then it becomes hard to find again. It also impacts the ability to cross-reference the current version with previous versions, because the previous versions are hard to find.

The artefact search query (particularly `https://test-observer-api.canonical.com/v1/artefacts?family=deb`, but possibly also other families) should be tweaked to enable the option to return archived results.