This corrects an oversight where the basic security MR widget was only
checking for security artifacts from the first page of jobs returned by
the API. This meant that, for a pipeline with a lot of jobs, the MR
widget might incorrectly not be shown.

This change makes sure that additional pages are requested until either
the last page has been reached, or one or more security artifacts have
been found.

Addresses https://gitlab.com/gitlab-org/gitlab/-/issues/276440.