fix(backdrop): nvda no longer incorrectly announces backdrop

[liamdebeasi]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: resolves #22102

What is the new behavior?

• NVDA reads the backdrop as clickable since it has an onClick listener. However, this causes NVDA to announce "clickable" when the popover opens which is confusing
• Where users cannot tab to the backdrop, we chose to remove the backdrop from the screen reader tree entirely

Does this introduce a breaking change?

• Yes
• No

Other information

[brandyscarney]

How do users close the popover without being able to click the backdrop?

[liamdebeasi]

How do users close the popover without being able to click the backdrop?

Users currently cannot dismiss a popover unless the popover dismisses when selecting a button. We need a better way to handle this but need to do more research first in order to implement this fix.