Kanban board: Visual instructions not provided for drag & drop functionality

Issue Summary

Visual instructions are not provided for drag & drop functionality. 

Steps to Reproduce

1. Navigate to any kanban board page.
2. Navigate with keyboard through issues in main content area.
3. Observe that there are no visual instructions provided to help user perform drag & drop functionality for issues.

Actual Results

On kanban board, users can perform drag & drop functionality for Issues to move from one column to other. Currently the instructions on how to perform operation using keyboard are provided only for screen reader users & they are not available visually on the page. 

This makes low-vision & keyboard-only users difficult to understand the instructions for drag & drop.

Note: This issue is also applicable on "Backlog" page, hence needs to be fixed there also.

Expected Results

The important instructions required for users to complete a task effectively should be available on the page persistently visible.

In this case the instructions on how to perform drag & drop operations using keyboard should be available on the page visually. This will benefit all users groups to complete the task effectively.

Ensure that the instructions are provided before the swimlanes start so that users can access them before performing drag & drop of Issues.

Note: While fixing this issue we might have to remove the existing off-screen instructions provided on the issues so that they are not redundant with visual instructions.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available