Follow-up from "Change Vulnerabilities Count Data Retention to 1 year"

As per internal slack discussion, add user documentation for the new 1-year retention.

The following discussion from !40766 (merged) should be addressed:

@mayra-cabrera started a discussion: (+7 comments)

The jump from 90 to 365 is considerable, do you mind sharing why this number was chosen?

Implementation Plan

Update Group Security Dashboard. History past 90 days is available via the GraphQL API
Update GraphQL VulnerabilitiesCountByDay. Add retention information.

Edited Oct 07, 2020 by Lindsay Kerr