Storybook: Adds story for PublishDateTimePicker

[vipul0425]

What?

This PR adds story for PublishDateTimePicker component.

Why?

Part of: #67165

Testing Instructions

1. Start Storybook by running npm run storybook:dev
2. Open Storybook at http://localhost:50240/
3. Test the story for PublishDateTimePicker

Screenshots or screencast

[github-actions]

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