Promote work item dev MR list out of FF

What does this MR do and why?

Promote work item dev widget as per comment #440851 (comment 2036126340)

Changelog: added

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

	Default(work_items_alpha FF off) and no other FF on	work_items_alpha FF on
With no MR list
With MR list

How to set up and validate locally

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

1. Switch off work_items_beta and work_items_alpha FF
2. Go to any task and see that you are not able to see the dev widget
3. Connect the task with an MR by using "Resolves #iid" in the description of the MR
4. See that you are able to see the listed MR in the dev widget
5. Switch on work_items_alpha FF
6. See that you are able to see dev widget in tasks even when no MR is linked (empty state buttons +, Create MR, Create branch visible)