Block Card: Remove storybook for internal BlockCard component

[Infinite-Null]

Related to: #67165

What?

Removes Storybook documentation for the internal BlockCard component.

Why?

According to recent discussions, internal components that are not intended for public use should not be exposed in Storybook. This keeps our Storybook documentation focused on components that are actually useful for WordPress extenders and makes the documentation more maintainable.

Testing Instructions

• Run npm run storybook:dev
• Open Storybook at http://localhost:50240/

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Co-authored-by: Infinite-Null <[email protected]>
Co-authored-by: Mamaduka <[email protected]>

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[Infinite-Null]

Hi @t-hamano,

According to this comment internal components should not be exposed in Storybook as they are not intended for use by WordPress extenders. Given that BlockCard is an internal component,This PR removes Storybook documentation to align with this direction.

Please review it at your convenience. Thank You!