Security Dashboard: leveraging sparklines to show vulnerability trends

Problem

Line graph shows vulnerabilities in a comparison display. The data-visualized should display trends, not a comparison of different severities with each other.

Solution

Leverage sparklines on individual severities to display trends over time.

Current/In progress	New Solution	Visual
Current dashboard view based on https://gitlab.com/gitlab-org/gitlab-ee/issues/12846 (dependency in %12.2) and https://gitlab.com/gitlab-org/gitlab-ee/issues/11190. Also, upcoming https://gitlab.com/gitlab-org/gitlab-ee/issues/13298.	Changes include: 1) leveraging sparklines to show trends over time to individual vulnerability type, 2) severity label same as seen in the table (visual consistency), 3) percentage of change in selected days 30/60/90, help users understand how they have progressed +/-, 4) current # vulnerability count displayed	Updates in context of page

Dependencies

• Layout change needs to be completed: #12846 (closed)