Add "check-circle-dashed" icon to library

Purpose

Adding a new icon that represents the concept of "no longer detected" as part of #202 (closed).

Screenshots

Checklist

For a new icon and/or illustration:

• If this adds an icon ensure that it follows the new icon checklists.
• If this adds an illustration ensure that it follows the new illustration checklists.

Closes #202 (closed)