[UI v2] experiment: Adds dark mode decorator for all stories

[devinvillarosa]

Adds a dark mode storybook decorator, and applies it to all stories.
Although dark mode does not seem to be a priority, it will help developers be more conscious about it when developing components

Screen.Recording.2025-01-09.at.12.42.48.PM.mov

Checklist

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Relates to #15512

[desertaxle]

Makes sense to me!