Improvements to parent filters

As a user, I need a better experience in delivery plans to see all my work by one or more parents. I should be able to select multiple parent work items across all teams.

Initial state, an empty "filter by parent" search box with no parent selected.

screen shot 1 of new parent filters

See all available parents relative to the teams and backlog levels.

screen shot 2 of new parent filters

Once one or more parents are selected (filter is active), we show the checkbox asking if you want to see the hierarchy view.

screen shot 3 of new parent filters

Introduce a menu on the work items, that when clicked, will apply the parent filter across all teams.

screen shot 4 of new parent filters