aio-notification close button needs a more specific accessible label

The close button for <aio-notification> only reads “Close” without additional context. For assistive technology users, it’s not clear what is being closed. While adding some additional label content would help this, it would probably also help to make the whole component something like role="group" to communicate the whole notification is one “thing”.

[jelbourn]

@noobyogi0010 two things:

• Add a more specific close label for the notification. This is probably going to need to be an input on the component since it’s going to depend on the content
• Additionally, try putting the notification container element a role="group" and see how it impacts the experience with a screen reader

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