Realtime updates for task descriptions

What does this MR do and why?

Add work item description subscriptions

Needed for Work Item editing conflict resolution (#362967 - closed)

Screenshots or screen recordings

Screen_Recording_2022-11-02_at_2.51.43_pm

How to set up and validate locally

1. Add a new task to an issue
2. Open task in another window
3. Edit description and save
4. Updated in both places

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.