Add a "has_vulnerability" property on Package and Component to support Queries and Column Templates and Product Review

[DennisClark]

To get more value out of our VulnerableCodeDB integration, it would be great if we could add a "has_vulnerability" property to both the Package model and the Component model to support queries and column templates.

This is complicated by the fact that the DejaCode Report system is made to work on the DejaCode Database values, I'm not sure how we'll be able to accomplish since the Vulnerability data is stored in an external DB.

One idea would be to fetch both list of all vulnerable PURLs and CPEs references in the VulnerableCodeDB and store this the DejaCode cache. These lists could be updated in the cache on a daily basis. This would required new specialized API endpoints on the VulnerableCode side. (Also, as a first step before implementing any of this, we should get some stats about the amount of data stored in the VulnerableCodeDB and how it will evolve.)

We have a working prototype for this but we do not have the infrastructure in place for periodic async tasks (the celerybeat worker service need to be setup, or alternatively we could complete the migration to RQ that has direct support for periodic tasks. ( @tdruez please update this remark if the RQ migration complete is now complete ).

Also we might consider a few additional things (maybe they belong in different issues, but perhaps best discussed in this context first):

• Think about automatically setting a (new) Product Inventory Status of “Vulnerability review required” when a vulnerable package is assigned to a product. Perhaps we do that in addition to a background process that looks at updated vulnerabilities (VulnerableCodeDB history dates are coming soon) and sets/resets those status values appropriately. An advantage of such an approach is that we can already filter by Product Inventory status (product relation status).
• Alternatively (or also) provide a command on Product Inventory that filters to show just the items (packages mostly) with vulnerabilities.
• And, if we end up doing the primary point of this issue, perhaps we can have a filter on the user view packages list that filters to show only packages with vulnerabilities.

[tdruez]

Implemented in #148