Update PHP block support code in lib/block-supports/border.php to use…

[benazeer-ben]

… the non __experimental prefix

What?

Updating php code to work both '--experimental' and non '--experimental ' prefix.

Why?

Borrowing from the format of #63001, this issue outlines the tasks needed to stabilize the __experimentalBorder support. Doing so will make it easier for third-party extenders to confidently build custom blocks that provide border support and modify existing blocks with this support.

How?

Updating PHP block support code in lib/block-supports/border.php to use the non __experimental prefix, falling back to the __experimental prefix if available.

Testing Instructions

1. Open a post or page.
2. Apply border to any of the section in the post/ page/ template.
3. Border functionality will work fine even after updating the code with non experimental prefixes.

NOTE: This PR is only handling the PHP block support code updation for non experimental prefix.

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