refactor: remove unnecessary fields from accordion block.json files

[R1shabh-Gupta]

What?

Closes #71434

Removes unnecessary and invalid fields from accordion block.json files to clean up the block definitions and improve code quality.

Why?

The accordion blocks contained several unnecessary fields that were either unused, invalid:

• Version numbers are not needed for core blocks
• Some attributes were defined but never used in the code
• Invalid support properties that don't exist in the block editor

This cleanup improves maintainability and reduces confusion for developers working with these blocks.

How?

The following fields were removed from the accordion block.json files:

Accordion block (core/accordion):

• Removed allowedBlocks attribute

Accordion Content block (core/accordion-content):

• Removed "version": "0.1.0" field
• Removed supports.align

Accordion Header block (core/accordion-header):

• Removed "version": "0.1.0" field
• Removed invalid supports.border

Accordion Panel block (core/accordion-panel):

• Removed "version": "0.1.0" field
• Removed invalid supports.border

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Co-authored-by: R1shabh-Gupta <[email protected]>
Co-authored-by: shail-mehta <[email protected]>
Co-authored-by: t-hamano <[email protected]>

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[shail-mehta]

LGTM👍

[t-hamano]

LGTM!