bug(datepicker): two navigation stops with Voiceover

[zarend]

For the datepicker component, voiceover gives two navigation stops when navigating dates on the calendar.

Reproduction

Steps to reproduce:

1. Open the Datepicker Examples
2. Navigate to "Single date selection"
3. Activate "Open calendar" button
4. (calendar UI appears with dec 9 selected)
5. Press CMD+OPTION+Right
6. (Dec 10 selected)
7. Press CMD+OPTION+Right
8. (Dec 10 selected. reads "10")
9. Press CMD+OPTION+Right
10. (Dec 11 selected)

Expected Behavior

only 1 nav stop

Actual Behavior

2 navigation stops

Environment

| OS | macos 12.0.1 (21A559) | | Browser | Chrome Version 96.0.4664.93 (Official Build) (x86_64) | | Screenreader | Voiceover |

Additional Notes

This is copied from an internal bug report found during a11y testing.

datepicker-2-nav-stop.mov

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