chore(button): skeleton size prop audit

[sstrubberg]

REF 10295

• Added FeatureFlag ternary for ButtonSkeleton size prop based on guidance provided by design. REF
• Removed the defaultProps object and moved them into default params. REF
• Updated the public snappy and other tests because i moved the defaultProps.

Testing

• Make sure Button is behaving correctly in the v11 & v10 storybooks and that size props are accurately reflected according to the design guidance.
• Ensure I haven't ruined someone's day from the tests I updated.

[netlify]

✔️ Deploy Preview for carbon-react-next ready!

🔨 Explore the source changes: 5018193

🔍 Inspect the deploy log: https://app.netlify.com/sites/carbon-react-next/deploys/6203ac576cf3090007b084dc

😎 Browse the preview: https://deploy-preview-10559--carbon-react-next.netlify.app

[netlify]

✔️ Deploy Preview for carbon-elements ready!

🔨 Explore the source changes: 5018193

🔍 Inspect the deploy log: https://app.netlify.com/sites/carbon-elements/deploys/6203ac5717041c000734b984

😎 Browse the preview: https://deploy-preview-10559--carbon-elements.netlify.app

[netlify]

✔️ Deploy Preview for carbon-components-react ready!
Built without sensitive environment variables

🔨 Explore the source changes: 5018193

🔍 Inspect the deploy log: https://app.netlify.com/sites/carbon-components-react/deploys/6203ac5747206d0008141508

😎 Browse the preview: https://deploy-preview-10559--carbon-components-react.netlify.app

[abbeyhrt]

Looks good to me!