Separator Border Block Support

[karthick-murugan]

What?

Add border block support to the Separator block.

Part of #43247

Why?

Separator 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 Separator block's border is configurable via Global Styles
• Verify that Global Styles are applied correctly in the editor and frontend
• Edit template/page, Add Separator 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

None

Screenshots or screencast

In Backend:

In Frontend:

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[github-actions]

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