refactor(Avatar): move files to folder, add e2e tests and stories

[josepmartins]

Tracking issue: https://github.com/github/primer/issues/1488

Add storybook stories for Avatar

Checklist

• Ensure your chosen component has a component directory in the src directory
• Ensure the component has a root story file in the component directory
• Ensure that the root story file exports a Default story
• (Optional) Create a Playground story
• Move all other stories for the component into a .features.stories.tsx file
• Opt the component into storybook tests
• (Optional) Create visual regression tests for the component

[changeset-bot]

⚠️ No Changeset found

Latest commit: e377015

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[github-actions]

size-limit report 📦

Path	Size
dist/browser.esm.js	89.74 KB (+0.01% 🔺)
dist/browser.umd.js	90.28 KB (+0.01% 🔺)

[colebemis]

💖