New notification fixes (#6955)

* 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.

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