add end-to-end icinga check(s) that graph objects are browsable via the Web UI

It has happened in the past that some objects from the archive were not accessible via the Web UI (e.g., contents due to the object storage not being available, but of course any other reason might happen). We should add end-to-end incinga checks that via the Web interface (i.e., checking the HTML in horrible ways) we can access various kind of objects. One object per type sounds like the right way to go:

Migrated from T1075 (view on Phabricator)

Edited Oct 18, 2022 by Nicolas Dandrimont