Initialise popup from list rather than index

Jack Chapmanrequested to merge
jc/only-show-popup-on-list-view into master

What does this MR do and why?

Changes the logic for displaying the 'new unified list' badge and related popover so that it only shows when loading the consolidated list view.

Caveats

When loading a work item detail page (/work_items/:iid) the badge will not be displayed, but when navigating to the list (/work_items) via the breadcrumbs, it will become visible.

When loading a work item list page (/work_items) the badge will be displayed, and when navigating to a detail page (/work_items/:iid) in the same namespace via the fullscreen button within the drawer, the badge will not disappear and will remain visible.

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Relates to !213197 (merged) Relates to #579608 (closed)

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