Description
This PR fixes an accessibility issue where CheckedPopupMenuItem was not
properly announcing its checked state to screen readers.
Before
https://github.com/user-attachments/assets/b1785522-eea4-4fc3-9a9a-1872615838c0
After
Demo app: https://checked-0707.web.app/https://github.com/user-attachments/assets/a8083c0b-11c8-4e93-bd71-842dfe5fa344
Issues Fixed
This PR fixes https://github.com/flutter/flutter/issues/171463.
Breaking Changes
None.
## Pre-launch Checklist
- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.
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