Storybook: Add stories for DateFormatPicker Component

[SainathPoojary]

Part of #67165

What?

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

Why?

• To provide clear visual documentation for the DateFormatPicker component.
• To enable interactive testing for various DateFormatPicker 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 the following stories are present and functioning:
   • Default rendering of the DateFormatPicker.
   • DateFormatPicker with the format set to null.
   • DateFormatPicker with defaultFormat set to empty string.

Screencast

Screen.Recording.2024-11-26.at.9.35.24.AM.mov

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

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