Accessibility: Add screen reader announcements for upload image errors
Description
This PR adds screen reader announcements for upload image failures and dismiss interaction.
Trac ticket: https://core.trac.wordpress.org/ticket/63114
This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.
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Props yogeshbhutkar, joedolson.
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A commit was made that fixes the Trac ticket referenced in the description of this pull request.
SVN changeset: 60263 GitHub commit: https://github.com/WordPress/wordpress-develop/commit/fe0427c68958b03d47b01119e8cd0a93be9f6b7f
This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.