Backlog - Versions and Epics filter: Missing the region landmarks on the page.

Issue Summary

On backlog page, the sections such as "Versions panel" , "Epics panel" , "Backlog panel" & "Issue detail view", etc are not marked as landmarks.

Issue id: 734902

Steps to Reproduce

1. Navigate to Jira dashboard page.
2. Navigate to any project inside Jira.
3. Navigate to the backlog page. 
4. Navigate to "Epics" & "Versions" elements in main content.

Actual Results

While navigating with screen reader, the sections such as "Versions panel" , "Epics panel" , "Backlog panel" & "Issue detail view", etc are not marked as landmarks. 

So it becomes difficult for screen reader users to jump from one section to another. 

Expected Results

The sections such as "Versions panel" , "Epics panel" , "Backlog panel" & "Issue detail view", etc should be marked as landmarks. Screen reader users use landmarks to jump between multiple sections on the page quickly.

Provide role="region" & unique label to each landmark via aria-label attribute.

For Example 

<div role="region" aria-label="Version panel" id="ghx-version-column"/>

<div role="region" aria-label="Epics panel" id="ghx-epic-column">

<div role="region" aria-label="Backlog panel" id="ghx-backlog-column">

<div role="region" aria-label="Issue details panel" id="ghx-detail-view">

Please refer to following page to understand more about landmarks. 

https://hello.atlassian.net/wiki/spaces/A11Y/pages/1449971838/Landmarks 

Screenshot

Workaround

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