feat : DefaultButton v9 migration

[v-sharmachir]

Details

DefaultButton v9 migration

Motivation

Context

Pending:

• Need to fix issues with High contrast for Dialog buttons, this will be fixed during Dialog component migration.
• Need to fix Icons margin for Primary buttons, as they appear little close to text, this will be fixed during Icon migration.

Pull request checklist

• [ ] Addresses an existing issue: #0000
• [ ] Ran yarn fastpass
• [ ] Added/updated relevant unit test(s) (and ran yarn test)
• [ ] Verified code coverage for the changes made. Check coverage report at: <rootDir>/test-results/unit/coverage
• [ ] PR title AND final merge commit title both start with a semantic tag (fix:, chore:, feat(feature-name):, refactor:). See CONTRIBUTING.md.
• [ ] (UI changes only) Added screenshots/GIFs to description above
• [ ] (UI changes only) Verified usability with NVDA/JAWS