fix(forms,tables): improve native Select styling and correct Table extends documentation

[jzempel]

Description

This PR addresses a smattering of issues and cleanup with the v9 codebase.

🐛 Fixes

• override browser UA opacity styling for native Select (uncovered during css-components refactor)
• @extends documentation for Table

🌱 Internal

• remove non-functioning size snapshot testing from the build
• restructure internal MessageIcon to follow proper Garden view-element component conventions

Checklist

• 👌 design updates will be Garden Designer approved (add the designer as a reviewer)
• 🌐 demo is up-to-date (npm start)
• ⬅️ renders as expected with reversed (RTL) direction
• ⚫ renders as expected in dark mode
• 🤘 renders as expected with Bedrock CSS (?bedrock)
• 💂‍♂️ includes new unit tests. Maintain existing coverage (always >= 96%)
• ♿ tested for WCAG 2.1 AA accessibility compliance
• 📝 tested in Chrome, Firefox, Safari, and Edge

[coveralls]

coverage: 95.895% (-0.008%) from 95.903%
when pulling 620600c on jzempel/misc-fix
into 3cb8cab on main.

[ze-flo]

Nice refactor and clean up. 🧼 💯

I'll pull the changes into #1952 and resolve the conflicts after this merges. 👍

[ze-flo]

❤️