[IconButton] Component improvements

[ravisuhag]

Summary

IconButton is a custom button component for icon-only actions. Has redundant accessibility attributes and minor improvements.

Improvements

Moved to Cross-Cutting Issues

The following items have been moved to cross-cutting issues that address them across all components:

• Accessibility baseline (Accessibility baseline: aria attributes, roles, and semantic HTML #673)
• Forward HTML attributes (Forward HTML attributes (spread rest props) #674)

Files

• packages/raystack/raystack/components/icon-button/