WorkItems: Add edit button to health status widget

What does this MR do and why?

1. Add edit button to health status widget, disable inline editing
2. When not in edit mode, add a h3 above the value as a landmark in the sidebar. In edit mode, visually hide it and put in label/field
3. Rename existing parent widget to work_item_health_status_inline.vue

Issue: #429142 (closed)

Screenshots or screen recordings

KR 1 Key Result Flight Nov 27.mp4

https://www.loom.com/share/593a021da6a74dfb9c74590cbcf16d14

How to set up and validate locally

1. In rails console enable flags

   Feature.enable(:okrs_mvc)
   Feature.enable(:work_items_mvc)
   Feature.enable(:work_items_mvc_2)

2. Visit any objective/keyresult work item, i.e. http://127.0.0.1:3000/flightjs/Flight/-/work_items/43. If you don't have any you can go to issue list page of a project and create an Objective`

3. Edit the health status

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.

Related to #429142 (closed)