Navigation Link: Add Border and Spacing support

[karthick-murugan]

What?

Add border and spacing block support to the Navigation Link( Custom Link ) block.

Part of #43247
Part of #43243

Why?

Navigation Link( Custom Link ) block is missing border and spacing support.

How?

Adds the border and spacing block support in block.json

Testing Instructions

• Go to Appearance > Editor > Styles > Edit Styles > Blocks.
• Ensure the Navigation Link( Custom Link ) block’s border and spacing are configurable via Global Styles.
• Confirm Global Styles apply correctly in both the Editor and Frontend.
• Open the Page or Template where you want to add the menu.
• Add a Navigation block (the container block for all navigation links).
• If WordPress detects pre-existing menus, it may prompt you to start with an existing menu. Choose Create a new menu if starting fresh.
• Within the Navigation block, select any pre-existing page links.
• That is the Navigation Link( Custom Link ) block and the block name could be a Custom Link, Post Link, Page Link, Category Link, or Tag Link, depending on its type.
• Verify Border, Radius, and Spacing settings are available for this link.
• Check that block-specific styles (e.g., borders, spacing) take precedence over Global Styles.
• Ensure borders and spacing display correctly in both the Editor and Frontend.

Testing Instructions for Keyboard

Screenshots or screencast

In Backend:

In Frontend:

[github-actions]

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[github-actions]

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