[Notification]: Investigate deprecating hasFocus prop

[tay1orjones]

I think we actually need to deprecate hasFocus - the spec for alertdialog states that focus should always be given to a focusable element within the dialog. This originally came up in slack

In #14877, focus wrap behavior was implemented for the ActionableNotification. I think it was a slight oversight to leave hasFocus in. Even with hasFocus off, I believe the wrapFocus() helper always focuses the currentActiveElement that is passed in.

Even if it doesn't, this prop should be deprecated because the spec states that focus should always move to the alertdialog.

• Deprecate the hasFocus prop
• Ensure focus always moves to the ActionableNotification

I think many of the use cases previously using ActionableNotification hasFocus="false" should actually use StaticNotification once it's available, #15532