fix(CopyButton): adjust aria-live, add closeOnActivation

[tw15egan]

Closes #13163

removes the aria-live that was causing the voiceover to read the copy text twice. This seems like a holdover from before we used IconButton under the hood. Since IconButton has proper aria roles and labels, it can handle the voiceover itself.

Also noticed an issue where the popover content was being closed immediately upon activation, rendering the feedback text useless

To fix this, I've added the closeOnActivation prop as configurable in iconButton, rather than setting it to always be false. It is passed in as false from Copy

Changelog

Changed

• closeOnActivation can be configured in iconButton

Removed

• aria-live was removed from CopyButton

Testing / Reviewing

Ensure there are no a11y violations. Ensure the voiceover only reads the feedback text once.

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[aledavila]

lgtm. no a11y violations and it doesn't keep repating copied

[andreancardona]

😎