Stabilize --experimentalBorder php file changes

[benazeer-ben]

• This is the PR connected with this PR for the issue mentioned in this ticket Stabilize Border Block Support Keys for WP 6.8 gutenberg#64312

• Here , I have added the php file changes for the solution.

• Changes added in the border.php file.

[github-actions]

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Props benazeer.

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[github-actions]

Hi @benazeer-ben! 👋

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[github-actions]

Trac Ticket Missing

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[github-actions]

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