Add ability for users to resolve work item threads
Summary
Legacy issues now have the ability to resolve threads, collapsing the thread by default for all users and marking it as resolved. This same functionality should be added for work items.
Acceptance criteria
- Users can resolve any comment/thread (no distinction between "comments" and "threads") via icon in the comment header, or resolve button next to reply input when exposed
- Resolved threads appear collapsed by default
- With the exception of consolidating comment/thread behavior, same functionality as legacy issues
Edited by Nick Leonard