Add out of date issues to the unscanned projects widget on the group security dashboard

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The first iteration of the unscanned projects widget shows projects with at least one unconfigured scan. This issue "out of date" projects.

"Out of date" is defined as projects that include all of the security scans in their latest pipeline, but that pipeline finished more than 5 days ago.

This issue was split out from #13298 (closed)

Edited by 🤖 GitLab Bot 🤖