Allow Dashboards to display list of error Issues containing/linked to User Feedback

### Problem Statement

Dashboard widget allows User Feedback Issues to be listed, but does not allow for error Issues with User Feedback to be listed.

-----------------
From the User Feedback issue, you can see linked error Issues. From an error Issue, you can see associated user feedback.
In custom Dashboard widget, you can list Issues for the former, but not the latter.

### Solution Brainstorm

Allow error Issues, that have user feedback attached, to be listed in a Dashboard widget.

### Product Area

Dashboards

No files or tests are named. Start by tracing the Dashboard widget entry point and the existing path that lists User Feedback Issues, then compare it with how linked error Issues are represented. Done means a dashboard widget can list error Issues that have associated User Feedback, with the behavior covered by the relevant dashboard tests.

Written by the indexing model from the issue text.