fix(datepicker): don't read all days of month on focus with screen reader

[andyfeds]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• If applicable, have a visual design approval

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: - VPAT-661 / CDE-34

What is the new behavior?

The unnecessary row/column info is not announced by NVDA, additionally the day of week is announced as expected.

Does this PR introduce a breaking change?

• Yes
• No

Other information

This fix was done in v16 & v17 , but not moved to v15, added the same fix to v15.
Older PR for reference: #957

[github-actions]

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