Add a single value "issue link" field to change records

Problem/Motivation

The current issues field is multi-valued and often filled with related issues that are not directly responsible for the change. This makes it difficult to find the issue where a change was made. And the related issues can be in the past or in the future.

Steps to reproduce

Proposed resolution

Add a single value field "Issue link" with description, "URL for the issue where this change is made."
Keep the current "Issue links" and description.

Remaining tasks

User interface changes

API changes

Data model changes