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.

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[aaronrobertshaw]

Thanks for putting this together @benazeer-ben 👍

As per the discussion over on WordPress/gutenberg#64312, we'll need a slightly different approach to stabilizing the border block support.

The stabilization of typography block supports serves as a guide here. There is also already a Gutenberg PR following that guide in WordPress/gutenberg#64330.

If you don't mind, I'd recommend closing this one while we pursue #64330, which will then get backported to core in due course.

[aaronrobertshaw]

I'm closing this PR in favour of WordPress/gutenberg#66918 which follows and enhances the approach to stabilization set out in WordPress/gutenberg#63401.

Those Gutenberg PRs will be backported here to core in a slightly different fashion. Rather than using a block type args filter, the plan is to address the stabilization within the block type class itself.

Thank you @benazeer-ben for helping explore possible solutions to stabilizing border supports. It's appreciated 🙇