Add delete subscriptions capability to the RH subscriptions page
|Target version:||Foreman - Team UX - Iteration 29|
|Velocity based estimate||-|
|Release||Katello 3.7.0||Release relationship||Auto|
Add the ability to delete the subscriptions to the Red Hat Subscriptions page. The button should be disabled when no rows are selected and then red when items are selected. A confirmation modal should be displayed after the button is pressed (not shown in mockups).