Draft: Add Awareness to Work Items and Tasks

What does this MR do and why?

Adds page- and field level Awareness to Work Items and Tasks #378650

This MR can only ship after:

• !102307 (closed)
• !102311 (closed)

Screenshots or screen recordings

awareness-for-tasks

How to set up and validate locally

1. Create a new issue with the administrator account. It is best to create a new project for this (with an easy to remember name).
2. Create at least 4 (5 or 6 are better) new local users (in addition to the always existing root/administrator account) which all need access to the newly created issue. For example:

• awareness1:supersecret
• awareness2:supersecret
• …
• awareness4:supersecret
• awarenessN:supersecret

1. You need 3 browsers to test (Chrome, Firefox, Safari for example) Session cookies are shared even between incognito tabs, you need to make sure to sign in with a clean browser environment.
2. Sign in with the individual users on every browser. Use one regular and one incognito window/tab
3. Open/Close tabs: You should see collaborators appear/disappear in the other windows/tabs
4. Hover over the +3 placeholder: You should see a list of users in the session

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.