Create MR/branch from a work item

What does this MR do and why?

Create MR/branch from a work item

Changelog: added

Behind FF work_items_alpha

References

Please include cross links to any resources that are relevant to this MR This will give reviewers and future readers helpful context to give an efficient review of the changes introduced.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Empty state when FF is off	Empty state when FF is on

State	Screenshot/Video
Empty state
Add icon open state
Add icon tooltip
Create branch	Screen_Recording_2024-11-20_at_13.05.57
Create merge request	Screen_Recording_2024-11-20_at_13.09.22

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Enable work_items_alpha FF
2. Go to any issue work item/task
3. You should be able to see the plus icon in the sidebar or the empty placeholder to create a merge request/create branch

Related to #477785 (closed) Resolves #477785 (closed)