Test: actions in the notifications accessible view

[meganrogge]

Refs #189486

• Windows @andreamah
• macOS @ulugbekna
• Linux @chrmarti

Complexity: 3

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Last iteration, we introduced an accessible view for notifications #187114.

This iteration, we have actions in the accessible view so a screen reader user can take those from there.

These actions include:

• navigating to the next or previous notification
• dismissing the notification
• taking any action present on the notification toast
• disabling the accessible view hint

To test this:

• Trigger some notifications and focus one.
• You should hear a hint about opening the notification in the accessible view.
• Open the accessible view via alt+f2.
• Shift+tab to the actions and try them out.
• Verify that as you take actions, the notifications are closing properly.

[andreamah]

👏