Reflect the addition of a "hide dismissed vulnerabilities" toggle in
security dashboards, see https://gitlab.com/gitlab-org/gitlab-ee/issues/9102

Tracked in https://gitlab.com/gitlab-org/gitlab-ee/issues/13496.

This commit updates a screenshot and the description
of the documentation of the group security dashboard to it is in
sync with the latest version of the dashboard.

A new param with_security_reports was added to
GET /groups/:id/projects API and the code to
support this logic in GroupProjectsFinder and
Project model. Also, a DB index was added to
ci_job_artifacts table to speed up the search
of security reports artifacts for projects

Includes admin_area and application_security
topics.

This commit includes changes to update the documentation so it
reflects the new navigation structure introduced by the additional
tab "Security & Compliance" to the project-views sidebar and
"Security" to the group-views sidebar.

* Screenshot
* Paths to the Dependency List
* Paths to the group-level security dashboard

Ensure that all numbered lists use only 1. and no other numbers.
Also ensure that numbered lists use proper spacing.