Improved reorderable lists for touch devices

What does this MR do and why?

Improves reorderable lists for touch devices by adding a 100ms delay for touch devices only that prevents orderable items from dragging immediately, so that touch users can scroll without reordering.

Impacted features:

• Epics > Child issues and epics tree
• Issues > Tasks list
• Work items > Child items tree
• Issues list w/ manual sort

Screenshots or screen recordings

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

Feature	Before	After
Epics > Child issues and epics tree
Issues > Tasks list
Work items > Child items tree
Issues list w/ manual sort

How to set up and validate locally

1. Epics: Open an epic with 2+ children (or create child issues/epics) and reorder
2. Tasks: Open an issue and create 2+ tasks
3. Work item child items
   1. rails c then Feature.enable(:okrs_mvc)
   2. From the issues list, New issue dropdown select New objective to create an objective
   3. Open the Objective and create 2+ child objectives or KRs
4. Issues list: Open the issues list, set sorting to "Manual"

In all cases the behavior on a non-touch device should be unchanged. Use something like Chrome DevTools device mode to emulate a touch device (or open on a touch device using the review app!).

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.

Closes #383462 (closed)