feat: adds StyledBaseIcon to various icon components

[geotrev]

Description

As a follow up to #1791, updates various components with new StyledBaseIcon.

Detail

Key changes to note:

• Replaces React.cloneElement(...) instances by extending StyledBaseIcon
• Updates custom props to transient props (non-consumer facing)
  • Updates a few prop signatures to map props to transient props

Package/component checklist

• react-buttons
  • StyledIcon
• react-forms
  • StyledFileIcon
  • StyledTextMediaFigure
• react-dropdowns
  • StyledInputIcon
  • StyledOptionIcon
  • StyledOptionTypeIcon
• react-typography
  • StyledIcon
• react-notifications
  • StyledIcon
  • StyledGlobalAlertIcon
• react-pagination
  • StyledIcon
• react-tags
  • StyledAvatar

Testing considerations:

• Visual testing IconButton instances (used my multiple packages)
• Visual testing Button.StartIcon and Button.EndIcon instances (used by multiple packages)
• Visual testing updated styled icon instances (package-specific)

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 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: 96.222% (-0.006%) from 96.228%
when pulling f7c3ee2 on george/styled-icon-refactor
into ff81ed3 on next.

[geotrev]

Not critical to this PR but I can't say no to DRY opportunities.

[jzempel]

this cleanup looks fantastic ✨