Screen Options: Add wp.a11y.speak support at various places for checkbox actions

[yogeshbhutkar]

Description

This pull request introduces speak announcements to provide audible confirmation for changes made to checkbox actions within the Screen Options panel.

Trac ticket: https://core.trac.wordpress.org/ticket/62550

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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.

[github-actions]

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[github-actions]

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Props yogeshbhutkar.

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