chore(storybook): update import, storybook titles

[tw15egan]

Refs #10768

The @carbon/react storybook was not compiling correctly after a recent change. This changes the import, as well as groups the newly added components with the other components.

Changelog

Changed

• import ThemeContext instead of unstable_ ThemeContext
• Added Components/ before storybook title

Testing / Reviewing

Ensure the v11 storybook renders properly

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