Storybook: Add stories for URLInputButton component

[SainathPoojary]

Part of #67165

What?

This PR adds Storybook stories for the URLInputButton component to improve component documentation and testability.

Why?

• To provide clear visual documentation for the URLInputButton component.
• To enable interactive testing for various URLInputButton scenarios.
• To enhance the development experience for Block Editor components.

Testing Instructions

1. Run npm run storybook:dev
2. Open Storybook at http://localhost:50240/
3. Verify working of URLInputButton story

Screenshots

2024-12-31.18-14-51.mp4

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Co-authored-by: SainathPoojary <[email protected]>

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