Resolve "Reorder work item sidebar widgets"

What does this MR do and why?

Reorders sidebar widgets to match original design.

Adds border to secondary "app" widgets per original design, creating a grouping of attributes without separation and then other details below.

Order currently only impacts tasks as OKR/Epic work items don't utilize affected widgets.

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.

Before	After	OKRs (no change, reference)

How to set up and validate locally

1. Run Feature.enable(:work_items_mvc) and Feature.enable(:work_items_mvc_2)
2. Open a task (Open issue > create task > open task)

Related to #440333 (closed)