Latest Comments: Add border block support

[karthick-murugan]

What?

Add border block support to the Latest Comments block.

Part of #43247

Why?

Latest Comments block is missing border support.

How?

Adds the border block support in block.json

Testing Instructions

• Go to Global Styles setting ( under appearance > editor > styles > edit styles > blocks )
• Make sure that Latest Comments block's border is configurable via Global Styles
• Verify that Global Styles are applied correctly in the editor and frontend
• Edit template/page, Add Latest Comments block and Apply the border styles
• Verify that block styles take precedence over global styles
• Verify that block borders display correctly in both the editor and frontend

Testing Instructions for Keyboard

Screenshots or screencast

In Frontend:

In Backend:

[github-actions]

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Co-authored-by: karthick-murugan <[email protected]>
Co-authored-by: akasunil <[email protected]>

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[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @karthick-murugan! In case you missed it, we'd love to have you join us in our Slack community.

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[akasunil]

Thanks for your contribution @karthick-murugan

✅ Global Styles apply correctly
✅ Block styles override Global Styles
✅ Styling is consistent between editor and front-end
✅ Box sizing allows parent container to enforce accurate width
✅ Border support is default, consistent with spacing support

Single-Posts-.-Template-.-gutenberg-.-Editor-.-WordPress.webm

LGTM 🎉

[akasunil]

@aaronrobertshaw I could appreciate a second opinion to make sure I haven't overlooked anything.