[SB7] Remove deprecated key prop in descriptionAddon

[sookmax]

Hey guys, I've noticed a warning previously not existed before SB7 is being printed when I open the browser inspector:

I searched around a bit, and it turned out key prop that had been fed into <AddonPanel> was now generating the warning so I removed it as recommended here.

Releted Storybook issues:

• [Bug]: render: key is not a prop issue since 7.2.0-alpha.0 storybookjs/storybook#23782
• Addons: Deprecate key in addon render function as it is not available anymore storybookjs/storybook#23792
• Don't use key anymore for rendering addon storybookjs/addon-designs#207

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[snowystinger]

GET_BUILD

[rspbot]

Build successful! 🎉

• View the storybook
• View the storybook-canary
• View the storybook-17
• View the storybook-16
• View the documentation

[rspbot]

## API Changes

unknown top level export { type: 'any' }
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unknown top level export { type: 'any', access: 'private' }
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[snowystinger]

Thanks for removing the warning!