Add border support to calender

[NidhiDhandhukiya74]

What?

Add border block support to the Calendar block.
Part of #43247

Why?

Calendar block is missing border support.

How?

Adds the border block support in block.json.

Testing Instructions

Go to Global Styles Settings. ( Under Appearance > Editor > Styles > Edit styles > Blocks )
Make sure that Calendar block's border is Configurable via Global Styles.
Edit Template/ Single Post Template & Add Calendar block and Apply the border Styles.
Verify that Calendar block styles take precedence over global Styles.
Verify that Calendar block borders display correctly in both the Editor and Frontend.

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

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[github-actions]

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[akasunil]

Hi @NidhiDhandhukiya74 Looks like calendar block had already open PR #64345 for border support. I'm closing this in favor of #64345