Issue #3585232: Scoped attachBehaviors to the newly rendered alert element.

Alison Nowickirequested to merge
issue/sitewide_alert-3585232:3.1.x into 3.1.x

fix: #3585232 Global Drupal.attachBehaviors() in init.js breaks other JS components.

By: alimc29 By: chrissnyder

Edited by Chris Snyder

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