The home notification static height of 116px is too cramped for longer
messages, such as the one used for the Sai migration. The old height is
now used for the minimum height instead, with a margin to ensure the
text doesn't get too close to the buttons.
* Replace use of backup-notification with use of home notification
* Pin notifications relative to window
* Remove unneeded isRequired condition on some home.component properties
* Refactor rendering of home notifications
* UX for multiple notifications
* Adds dismissal to provider request notification.
* Fix test failures
The e2e tests have been updated to reference `home-notification`
classnames instead of the removed `background-notification`. The
active tab proptypes and default values were updated as well.