Implemented sticky notification for site link sections

- Implemented $.ui.closeable widget.
- Added $.ui.EditableTemplatedWidget.notification() managing a notification on the widget.
- Applied the new functionality to $.wikibase.sitelinkgroupview and specifically circumvented
  triggering deprecated mechanisms generating tooltips.
- Fixed $.wikibase.sitelinklistview triggering setError() twice.

Bug: T74419
Change-Id: I7d635a4cf17bd14a3222f6341cb6579c6902e53e
Merge "Implemented sticky notification for site link sections"