Display work item epics in drawer

What does this MR do and why?

Adds the WorkItemDrawer component to the WorkItemListApp component if the issues_list_drawer feature flag is enabled.

Supports viewing Work Item details for all kinds of Work Items, including those in sub-groups and projects.

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.

Screen_Recording_2024-08-12_at_16.15.51

How to set up and validate locally

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

Enable the following feature flags:

• namespace_level_work_items
• work_item_epics_list
• issues_list_drawer

Visit the /epics list for a group and check you can view epics in the drawer after clicking them.

You should also be able to edit the epic and the changes should reflect in the list.

Deleting an epic will trigger a refresh of the list data.

Changing the state of an epic (closing or reopening) will refresh the list data (if you're not on the 'ALL' tab)

Relates to #463829 (closed)