Post Template: Add border support

[karthick-murugan]

What?

Add border and spacing block support to the Post Template block.

Part of #43247

Why?

Post Template block is missing border support.

How?

Adds the border block support in block.json

Testing Instructions

• Go to Appearance > Editor > Styles > Edit Styles > Blocks.
• Ensure the Post Template block's border is configurable via Global Styles.
• Confirm Global Styles are applied correctly in both the editor and frontend.
• Edit a template or page and add a Query Loop block.
• Select a variation (e.g., Title & Date) to list all the posts.
• Select the Post Template block and verify border and radius settings are available.
• Check that block styles take precedence over Global Styles.
• Ensure borders display correctly in both the editor and frontend.

Testing Instructions for Keyboard

None

Screenshots or screencast

In Frontend:

In Backend:

[github-actions]

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[github-actions]

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[github-actions]

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[shail-mehta]

Hi @karthick-murugan Thanks for the PR.

We are already tracking this here:
#64425

[karthick-murugan]

@shail-mehta - Thanks for letting me know. That PR was hided and I missed. I am closing this PR now.